1
NPort 6110 Modbus/TCP
to Serial Communication Gateway
User’s Manual
Third Edition, April 2005
Moxa Technologies Co., Ltd.
Tel:
Fax:
Web:
+886-2-8919-1230
+886-2-8919-1231
MOXA Technical Support
Worldwide:
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MOXA Internet Services
Customer satisfaction is our number one concern. To ensure that customers
receive the full benefit of our products, Moxa Internet Services has been set up to
provide technical support, driver updates, product information, and user’s manual
updates.
The following services are provided:
E-mail for technical support
Worldwide:
The Americas:
World Wide Web (WWW) site for product information
address: http://www.moxa.com
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1. Introduction.......................................................................................1-1
2. Getting Started..................................................................................2-1
Power Connection ........................................................................2-1
Serial Installation ..........................................................................2-1
Ethernet Installation......................................................................2-2
Software Installation .....................................................................2-2
Housing.........................................................................................2-7
DIN-Rail.................................................................................2-7
Wall Mount ............................................................................2-8
3. Typical Modbus Applications..........................................................3-1
Serial master device talks to serial slave
devices over the Internet ..............................................................3-1
Ethernet master devices talk to multiple
serial slave devices.......................................................................3-2
Serial master devices talk to multiple
Ethernet slave devices .................................................................3-3
4. Configuring Modbus Gateway ........................................................4-1
Starting Modbus Gateway Configurator........................................4-2
Searching for NPort 6110 .............................................................4-3
Broadcast Search..................................................................4-3
Specify by IP Address ...........................................................4-3
Modify Configuration.....................................................................4-4
Network Settings...................................................................4-5
Modbus Settings ...................................................................4-6
Advanced Modbus Settings ..................................................4-9
Modbus Serial Settings.......................................................4-12
Password ............................................................................4-14
Other Functions ..........................................................................4-15
Unlock .................................................................................4-15
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Upgrade Firmware ..............................................................4-15
Remote Monitoring and Management.................................4-17
5. Troubleshooting ...............................................................................5-1
6. Pin Assignments...............................................................................6-1
A. Declaration of Conformity.............................................................. A-1
B. Problem Report Form..................................................................... B-1
1-2
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1
1.Introduction
Welcome to Moxa NPort 6110 Modbus/TCP to Serial Communication Gateway,
an easy-to-use Ethernet to RS-232/422/485 Modbus Gateway.
This chapter is an introduction to NPort 6110 and includes the following
sections:
T
T
T
T
T
Overview
Features
Product Specifications
Package Checklist
Front/Top/Rear/Bottom Panel Views
Overview
Moxa NPort 6110 Modbus/TCP to Serial Communication Gateway provides
users with many excellent benefits, including:
y
y
y
Seamless integration of Ethernet and serial Modbus devices
Powerful operation modes for versatile Modbus applications
Windows utility for easy setup and traffic monitoring
Each of these benefits is explained in more detail below.
Seamless integration of Ethernet and serial Modbus devices
Modbus is one of the most popular automation protocols in the world. Modbus
protocol supports traditional RS-232/422/485 devices and newly developed
Ethernet devices. Many industrial devices, such as PLCs, DCSs, HMIs,
instruments, and meters, use Modbus as their communication standard. However,
the Modbus protocols that run over serial and Ethernet are so different that a
communication gateway is needed as a bridge for integration.
NPort 6110 supports one Ethernet and one software selectable RS-232/422/485
1-1
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port that can connect to many types of Modbus device. By translating
Modbus/TCP (Ethernet) and Modbus/ASCII/RTU (Serial) protocols, a PLC with
Ethernet can use the RS-232/485 interface to seamlessly communicate with
instruments.
Powerful operation modes for versatile Modbus applications
For Modbus protocol conversions, it is necessary to define a Master and Slave
device, but unlike other Modbus Gateways, NPort 6110 allows users to configure
Master/Slave for both the Ethernet and serial sides.
Extra address mapping and exception parameters are provided to ensure that
most situations can be handled.
Windows utility for easy setup and traffic monitoring
NPort 6110 is powerful yet very easy to use. An intuitive Windows utility
automatically searches for all available NPort 6110 units on the LAN.
Traffic Monitoring within the utility helps you troubleshoot any Modbus
communication problem, such as connection status check, or address translation
error check.
Features
T Integration of Modbus serial and Modbus Ethernet devices
T Supports connecting a Modbus/TCP Master device to up to 31
Modbus/ASCII/RTU slave devices
T Supports connecting a Modbus/ASCII/RTU master device to up to 4
Modbus/TCP slave devices
T Easy-to-use Windows utility for configuration over Ethernet
T 10/100M fast Ethernet with automatic IP setting (DHCP)
T One software selectable RS-232/485/422 interface
T High speed serial interface—up to 230.4 Kbps
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Product Specifications
LAN
Ethernet
10/100 Mbps, RJ45
Protection
Built-in 1.5 KV magnetic isolation
Serial
Interface
RS-232 Signals
RS-422 Signals
RS-485 2-wire Signals
Serial Line Protections
RS-485 Data Direction
RJ-232/422/485 x 1, DB9 (M), software selectable
TxD, RxD, RTS, CTS, DTR, DSR, DCD, GND
Tx+, Tx-, Rx+, Rx-, RTS+, RTS-, CTS+, CTS-, GND
Data+(A), Data-(B), GND
15 KV ESD for all signals
Patented ADDC™
(Automatic Data Direction Control)
Serial Communication Parameters
Parity
None, Even, Odd
7, 8
1, 2
RTS/CTS, XON/XOFF
1200 bps to 230.4 Kbps
Data Bits
Stop Bit
Flow Control
Speed
Software Features
Internet Protocols
Modbus Protocols
DHCP, BootP, TCP, UDP, IP, ICMP, ARP
Modbus/TCP, Modbus/ASCII, Modbus/RTU,
Master/Slave modes supported
Utilities
Modbus Gateway Configurator for Windows
95/98/Me/NT/2000/XP
Configuration
Windows utility via Ethernet
Power Requirements
Power Input
9 to 30 VDC
Power Consumption
300 mA at 12V (max.)
Mechanical Specifications
Material
Gross Weight
Aluminum sheet metal (1 mm)
0.88 kg (1.94 lb)
1-3
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Environmental
Operating Temperature
0 to 55°C (32 to 131°F), 5 to 95% RH
-20 to 85°C (-4 to 185°F), 95% RH
Storage Temperature
Regulatory Approvals
EMC
Safety
FCC Class B, CE Class B
CUL, TÜV
Package Checklist
NPort 6110
Modbus/TCP to Serial Communication Gateway with 100-240
VAC power adaptor (US, Euro plugs included)
All models include:
y
y
y
y
NPort 6110
Software and documentation CD-ROM
100-240 VAC power adapter, US plug, 12V, 400 mA
Euro plug included
Optional Accessories:
y
DK-35A DIN-Rail Mounting Kit (35 mm)
1-4
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Front/Top/Rear/Bottom Panel Views
RESET
10/100M
Ethernet
9-30V
6
(0.24")
PWR
4
Link
(0.16")
Ready
6110
Modbus/TCP to Serial
Communication Gateway
21.3
(0.8")
7
(0.28")
RS-232/422/485
42.3
(1.67")
unit = mm (inch)
67
(2.64")
78
(3.07")
90.2
(3.55")
1-5
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2
2.Getting Started
This chapter includes:
T
T
T
T
T
Power Connection
Serial Installation
Ethernet Installation
Software Installation
Housing
¾ DIN-Rail
¾ Wall Mount
Power Connection
Take the following steps to connect NPort 6110’s power adapter.
1. Plug the power adapter’s DC plug into NPort 6110’s DC-IN jack.
2. Plug the power adapter into an electrical outlet.
Note that there is no on/off switch. NPort 6110 automatically turns on when
plugged into the outlet, and the red PWR light on NPort 6110’s top panel will
glow to indicate that it is receiving power.
Serial Installation
NPort 6110 has one male DB9 serial port on the back panel. Depending on your
serial device and serial interfaces, there are two options:
1. You may use a DB9 to DB9 cable to connect your serial device to NPort
6110. Plug one end of the cable into the port on the back panel of NPort 6110
and plug the other end into your serial device’s serial port.
2. Refer to Chapter 8 for details of NPort 6110’s DB9 pinouts to make your
own serial interface cable.
2-1
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Ethernet Installation
There are two ways to use the 10/100BaseT Ethernet jack located on NPort
6110’s front panel:
1. For most applications using NPort 6110, you will simply plug one end of an
Ethernet cable into NPort 6110’s 100BaseT jack, and plug the other end into
an Ethernet hub/switch connected to your network. In this case, use a regular
straight-through Ethernet cable.
2. When configuring NPort 6110, you may connect NPort 6110 directly to your
computer’s Ethernet connector. To do this you will need to use a cross-over
Ethernet cable.
The amber Link light will flicker when NPort 6110 is properly connected to a
live Ethernet connection.
Software Installation
Follow the instructions given below to install Modbus Gateway Configurator,
the utility that allows you to configure and monitor multiple NPort 6110 units
over the network.
1. Insert the software CD-ROM that came with NPort 6110 into the CD-ROM
drive, and then double click on the Setup.exe icon that installs the NPort
Modbus Gateway Utility.
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2. You will be greeted by the Welcome window. Click on Next to continue.
3. Enter your Name and Company name in the spaces provided, and then click
on Next to continue.
4. When the Choose Destination Location window appears, click on Next to
continue. If you would like to use a Destination Directory different than the
one displayed, first click on Browse… to locate your folder of choice, and
then click on Browse.
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5. If desired, modify the highlighted name in the Program Folders text box (this
is the name that will appear under Start Æ Programs) and then click on
Next to continue.
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6. Click on Next to start copying the software files.
7. Wait patiently while the files are being copied. The procedure should only
take a few seconds.
8. The NPort Modbus Gateway Utility folder will open showing the Modbus
Gateway Configurator icon.
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9. You may also view this program shortcut by clicking on Start Æ Programs
Æ NPort Modbus Gateway Utility Æ Modbus Gateway Configurator, as
shown below.
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Housing
DIN-Rail
For many industrial applications, you will find it convenient to use the DIN-Rail
attachments, as shown below.
STEP 1: Use 2 screws per ear to attach DIN-Rail mounts to each of NPort
6110’s two ears.
⇒
STEP 2: Insert the top of the DIN-Rail STEP 3: Push the bottom of NPort
into the top slot of the
DIN-Rail mount.
6110 so that the bottom of the
DIN-Rail snaps into DIN-Rail
mount’s bottom slot.
NOTE: The DIN-Rail mounting kit is an optional accessory.
To remove NPort 6110 from the DIN-Rail, simply reverse Steps 2 and 3 above.
Grasp the bottom of the NPort 6110 unit with both hands, and then use your
fingers to pull down slightly on the bottom slot of the DIN-Rail mounts to
release the bottom of the DIN-Rail from the DIN-Rail mount.
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Wall Mount
For many industrial applications, you will find it convenient to mount NPort
6110 on the wall, using two screws, as indicated below.
STEP 1: Screw two screws, separated by 7.8 cm, into the wall. The heads of the
screws should be no greater than 6.5 mm in diameter, and the shafts
should be no greater than 3 mm in diameter. Do not screw the screws
in all the way—leave a space of about 2 mm to allow room for sliding
the NPort 6110 unit’s ears between the wall and the screws.
6.5 mm
7.8 cm
STEP 2: Insert the two screw heads
through the large parts of the
keyhole shaped apertures, and
then slide NPort 6110
STEP 3: For added stability, tighten
the two screws.
downwards, as indicated.
RESET
10/100M
Ethernet
9-30V
PWR
RESET
10/100M
Ethernet
9-30V
Link
Ready
PWR
Link
Ready
6110
Modbus/TCP to Serial
Communication Gateway
6110
Modbus/TCP to Serial
Communication Gateway
RS-232/422/485
RS-232/422/485
To remove NPort Express from the wall mount, simply reverse Steps 2 and 3.
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3
3.Typical Modbus Applications
In this chapter, we introduce three typical Modbus applications.
Serial master device talks to serial slave
devices over the Internet
Let traditional Modbus serial devices talk over the Internet…
Many traditional serial Modbus devices can talk over RS-485, but the RS-485
network limits the maximum number of Modbus devices to 32, provided the
transmission distance does not exceed 1.2 km.
By using Modbus Gateway, you can link all Serial Modbus devices over an
Ethernet network. Up to 4 Modbus Gateways can be installed in the same control
network, extending the coverage of a single Modbus network as far as a TCP/IP
network can reach.
NPort 6110
Modbus/RTU
Master device
RS-232
Ethernet
NPort 6110
NPort 6110
NPort 6110
RS-485
RS-485
RS-232
Modbus/RTU
Slave devices
Flow meter
Drives
Loop controller
Power measurement
PLC
DCS
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Ethernet master devices talk to multiple
serial slave devices
Connect all Modbus devices over the Ethernet network…
Most host computers and newly developed PLCs support the Ethernet interface
and run Modbus/TCP. NPort 6110 Modbus Gateway is needed to link discrete
Serial Modbus Devices for data collection and control.
Each NPort 6110 supports Modbus/TCP over Ethernet, which allows up to 7
connections. The software configurable serial interface supports either RS-232 or
RS-422/485. In RS-232/422 modes, NPort 6110 can be connected to 1 serial
device. Under RS-485 mode, NPort 6110 supports up to 31 serial devices, which
is the most popular application for factory floor applications.
Modbus/TCP
Master devices
Host
Computer
PLC
Ethernet
NPort 6110
NPort 6110
RS-485
RS-232
Modbus/RTU
Modbus/ASCII
Slave devices
Flow meters
Drives
Loop controller
Power measurement
(up to 31 devices)
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Serial master devices talk to multiple
Ethernet slave devices
Link the Serial Master device with Ethernet Slave devices…
Many HMI (Human Machine Interface) systems use a serial interface and are
required to access a discrete DCS (Data Control System). These days however,
more and more DCSs support Ethernet and run under Modbus/TCP slave mode.
In this case, NPort 6110 Modbus Gateway is the ideal solution to link the HMI to
distributed DCSs over an Ethernet network. Up to 4 Modbus/TCP slave devices
are supported by each NPort 6110.
Modbus/RTU
HMI
Master devices
RS-232
NPort 6110
Ethernet
Modbus/TCPSlave devices
(up to 4)
DCS
DCS
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4
4.Configuring Modbus Gateway
We discuss the following topics in this chapter:
T Starting Modbus Gateway Configurator
T Searching for NPort 6110
¾ Broadcast Search
¾ Specify by IP Address
T Modify Configuration
¾ Network Settings
¾ Modbus Settings
¾ Advanced Modbus Settings
¾ Modbus Serial Settings
¾ Password
T Other Functions
¾ Unlock
¾ Upgrade Firmware
¾ Remote Monitoring and Management
¾ Start Log Monitor
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Searching for NPort 6110
There are two methods available to search the network for NPort 6110s.
Broadcast Search is used to locate all NPort 6110s connected to the same LAN
as the host, and Search by IP is used to locate a specific NPort 6110,
particularly if it is located outside the LAN and can only be accessed by going
through a router.
Broadcast Search
To use the Broadcast Search function, click on the Broadcast Search icon from
the toolbar, or select Broadcast Search under the Locate Gateway menu.
After the search is complete, information related to all NPort 6110s located on
the LAN will be displayed in the Modbus Gateway Configurator window.
Specify by IP Address
To use the Specify by IP Address function, click on the Specify by IP Address
icon from the toolbar, or select Specify by IP Address under the Locate
Gateway menu.
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When the Search by IP Address window opens, input the IP address of the
NPort 6110 you want to search for, and then click OK.
If the search is successful, information related to the NPort 6110 will be
displayed in the Modbus Gateway Configurator window.
NOTE If using the Search by IP Address function fails to locate the NPort 6110,
one possible reason is that the IP address you entered to conduct the
search is incorrect. Try retyping the IP address and then redo the
search.
Another possibility is that the NPort 6110 is located on the same LAN as
the host, but on a different subnet. In this case, you can change the IP
address and/or Netmask of the host so that it is on the same subnet as the
NPort 6110.
Modify Configuration
To modify the configuration of an NPort 6110, first click on the row associated
with the NPort 6110 whose configuration you want to modify (to highlight the
row, as shown in the following figure). Next, click on the Modify
Configuration toolbar icon, or select Modify Configuration under the
Configuration menu.
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The Configuration window opens to the Network Settings page. Refer to the
following subsections to learn more about how to configure NPort 6110’s
various settings.
Network Settings
The Network Settings page is used to configure Modbus Gateway Name, IP
Address, Netmask, Default Gateway, and IP Configuration. At the top of the
page you may also view the Model Name, MAC Address, and Serial Number
of the NPort 6110. These three parameters are set at the factory and cannot be
modified by the user.
To modify a setting, first checkmark the box to the left of the setting’s
name to activate the setting’s text input box.
NOTE
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Network Settings
Value
Setting
Notes
Choose a name that easily
identifies the Gateway’s location,
function, etc.
Modbus Gateway Name Alphanumeric
The IP (Internet Protocol)
address identifies the server on
the TCP/IP network.
32-bit number,
default =
IP Address
192.168.127.254
32-bit number,
default =
255.255.255.0
Identifies the server as belonging
to a Class A, B, or C network.
Netmask
IP address of the router that
provides network access outside
the server’s LAN.
32-bit number,
default =0.0.0.0
Default Gateway
1. Choose Static IP if you are
using a fixed IP address.
Choose from Static
IP, DHCP, BootP, or 2. Choose one of the other
IP Configuration
DHCP/BootP.
options if the IP address is set
dynamically.
Modbus Settings
The Modbus Settings page is used to set up the Attached Serial Device type,
Initial delay time, and Modbus/TCP Slave device settings.
To modify the settings on this page, first checkmark the Change Modbus
Settings box.
NOTE
The Modbus/TCP Slave device settings are only active if the attached
serial device is set as one of the two Master types.
Choose the Modbus protocol of the attached serial device to determine the
complementary Modbus protocol for the NPort 6110 Modbus Gateway. Four
different types of serial Modbus device can be used. Since the Modbus protocol
is used on a Master-Slave network, there are two steps to consider before starting
the configuration process. The first step is to determine which devices are
Masters and which are slaves (either Ethernet or Serial device). Next, you need
to determine the Modbus protocol that the serial device uses.
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Modbus Settings
Value
Modbus RTU Slave1
Setting
Notes
Modbus ASCII Slave2
Modbus RTU Master3
Modbus ASCII Master4
Set the Modbus type of the
serial device attached to
NPort 6110’s serial port.
Attached Serial Device type
NPort Modbus Gateway
provides this setting for
those PLCs that need a
longer time for their
100 to 3276 ms;
default = 100 ms
Initial delay time
system to be initialized.
Modbus/TCP Slave device setting
Valid when the attached
serial device is a Modbus
RTU/ASCII Master.
IP address assigned to
the remote Modbus
slave device.
Remote Modbus Slave IP
Set this value to 0 (zero) to
disable the corresponding
Modbus/TCP slave device.
default = 502
1 to 247
TCP Port No.
The unique Modbus ID
number assigned to the
Modbus device.5
ID No. Range
Additional Information
When the serial Modbus device is running in Modbus/RTU Slave mode, the
NPort Modbus Gateway is ready to connect automatically to Modbus/TCP
Master devices. Up to 7 Modbus/TCP master devices can connect to one
serial Modbus slave device.
1.
2. Modbus ASCII Slave mode works the same as Modbus/RTU slave mode,
except that the data format is Modbus/ASCII.
3. When the serial Modbus device is running in Modbus/RTU Master mode, the
NPort Modbus Gateway is ready to connect automatically to Modbus/TCP
slave devices. You will also need to configure the IP address for up to 4
Modbus/TCP slave devices that can be connected to over the Ethernet
network.
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4. Modbus ASCII Master mode works the same as Modbus/RTU Master mode,
except that the data format is Modbus/ASCII.
5. When the NPort Modbus Gateway receives a command from the serial port,
the ID No. range table is used identify which IP address to connect to (e.g., if
ID No. = 15, then according to the table in the Modbus Settings page shown
above, the command is sent to the device that has IP of 192.168.127.3.
Advanced Modbus Settings
The Advanced Modbus Settings page is used to set up the Auto Slave Unit ID,
Character Timeout, Message Timeout, and Modbus/TCP Exception.
To modify the settings on this page, you must first checkmark the
Change Modbus Settings box at the top of the Modbus Settings page.
NOTE
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Advanced Modbus Settings
Value
Setting
Notes
Select Enable when
multiple Modbus devices
are accessible at the same
IP address.1
Enable (Default)
Disable
Auto Slave Unit ID
This parameter is active
when the attached serial
device is set to
10 to 3000 ms
Character Timeout
Message Timeout
(default = 100 ms)
Modbus/RTU.2
Allows you to configure
the message timeout for
communication between
connected Ethernet or
serial Modbus devices.
10 to 3000 ms
(default = 1000 ms)
This parameter is active
when the Modbus
Gateway connects a
Modbus/TCP Master with
Modbus serial slave
devices.3
default = 502
Modbus/TCP Exception
Additional Information
Modbus/TCP protocol contains a “Unit ID” field to identify multiple Modbus
slave devices accessible at a single IP address. When the Modbus/TCP
command contains a Unit ID, the Modbus Gateway can pass the Unit ID to
Modbus serial devices. This allows you to link to multiple serial devices with
a Modbus Gateway. Some PLCs assume that each IP connects to only one
device. In these cases, the Unit ID can be set “0,” but you must manually
assign a Unit ID (between 1 and 247) to the connected serial device.
However, each Modbus Gateway can connect to only one serial device.
1.
This setting is valid when [Attached Serial Device type] is set to [Modbus
RTU Slave ] or [Modbus ASCII Slave].
Enable: Uses the Unit ID in the Modbus/TCP packet. This is the default
setting.
Disable: Uses the predefined Unit ID instead of Modbus/TCP’s.
ID:
The predefined Unit ID value, ranging from 1 to 247, which is valid
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when Auto Slave Unit ID is “Disabled.”
When the Modbus serial protocol is set to Modbus/RTU, each message
packet is determined by a character timeout. An incorrect character timeout
might cause a CRC checksum error. NPort Modbus Gateway allows a
variable character time out setting, ranging from 10 to 3000 ms, when the
attached serial device is set to Modbus/RTU.
This setting is in effect when the Modbus Gateway connects a Modbus/TCP
Master with Modbus serial slave devices. When the Modbus Gateway can’t
get a response from Modbus serial devices, the Modbus serial protocol will
not respond to the master device. However, the TCP protocol has a longer
waiting time, which could cause a network traffic problem for Modbus/TCP.
For this reason, Modbus Gateway can automatically send a Modbus
Exception Code 16 to the Modbus/TCP master device when there is no
response from the Modbus serial slave devices, making overall network
communication much more efficient.
2.
3.
Yes: default.
No:
No Modbus/TCP exception handling.
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Modbus Serial Settings
The Modbus Serial Settings page is used to configure NPort 6110’s DB9 Male
port. You can configure Interface Mode, Baud Rate, Parity, Data Bits, Stop
Bit, Flow Control, and UART FIFO.
To modify the settings on this page, you must first checkmark the
Change Modbus Settings box at the top of the Modbus Settings page.
NOTE
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Modbus Serial Settings
Value
Setting
Interface Mode
Notes
RS-232
RS-422
NPort 6110 supports
2-wire RS-485 mode.
RS-485
1200 bps to 230400 bps
Baud Rate
Parity
None, Odd, Even,
Space, Mark
7, 8
1, 2
Data Bits
Stop Bit
None, Xon/Xoff,
RTS/CTS
Flow Control
UART FIFO
Enable, Disable
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Password
Use the Password page to set a password, change the password, or erase the
password.
To modify the settings on this page, you must first checkmark the
Change Password box at the top of the Password page.
NOTE
To erase an existing password, leave both the New Password and
Confirm Password text input boxes blank, and then click OK in the
bottom right corner of the window.
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Other Functions
The Unlock, Start Log Monitor, and Upgrade Firmware functions are
described in this section.
Unlock
The Unlock function is used for NPort 6110 units that are password protected.
To use the function, first click on the NPort 6110 that you wish to unlock to
highlight it, and then click on the Unlock toolbar icon, or select Unlock under the
Configuration menu.
Upgrade Firmware
Use the Upgrade Firmware function to upgrade NPort 6110’s firmware, which
To use this function, first click on the NPort 6110 whose firmware you want to
download to highlight it, and then click on the Upgrade Firmware toolbar icon,
or select Upgrade under the Firmware menu.
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When the Open window appears, navigate to the folder that contains the NPort
6110 firmware file, and then click on the file name. Make sure the correct
filename appears in the File name box, and then click on the Open button to start
downloading the firmware.
Once the downloading process ends, click on Close to close the Upgrade
Firmware window. The Broadcast Search function will be activated
automatically and search the LAN for all NPort 6110s.
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Remote Monitoring and Management
To troubleshoot and manage Modbus-based device connectivity, information
such as TCP/IP, Modbus protocol type, and Master/Slave type are important.
NPort Modbus Gateway provides a powerful function that allows you to monitor
the operation of each Modbus Gateway on the Internet. The log monitor records
detailed actions, such as operation modes, serial communication parameters, and
TCP/IP connectivity for the NPort Modbus Gateway. These records include
date/time and can be saved as a text file for maintenance or service record.
Start Log Monitor
To start the Log Monitor, first click on the NPort 6110 you wish to monitor to
highlight it, and then click on the Start Log Monitor toolbar icon, or select
Start under the Log Monitor menu.
A Log Monitor window specific to the selected NPort 6110 will appear in the
bottom half of the Modbus Gateway Configurator window. Note that you can
open a separate Log Monitor window for other listed NPort 6110s by repeating
this process.
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To start capturing the operation log, press the Start Log Monitor button
.
The operation log appears with time stamp stating connection status for
connected Modbus devices. To keep a record of this monitor session, save the
log to a text file. To clear all the records, press the Log Monitor Flush button
.
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5
5.Troubleshooting
In this chapter, we give answers to some common troubleshooting questions
related to Modbus Gateway applications.
1. ID No. mismatch
ID number mismatch is the most common field installation problem encountered.
First, make sure the ID number of each Modbus device corresponds to the
settings in the automation software on the computer. Pay attention to Modbus
Gateway’s configuration to avoid ID number issues.
1.1 When [Attached Serial Device] is set to [Modbus/RTU Slave] or
[Modbus/ASCII Slave], and the [Auto Slave Unit ID] is disabled, the
Modbus Gateway will use a fixed ID number. Make sure the ID number of
the serial device is identical to the settings in the Modbus Gateway.
1.2 When [Attached Serial Device] is set to [Modbus/RTU Master] or
[Modbus/ASCII Master], the Modbus Gateway replies on [ID No. Range]
to transfer the serial Modbus device command to the IP address of the
correct Modbus/TCP device. The ID number in the Ethernet device and
Modbus/TCP slave device setting table must match.
2. Modbus Address configuration error
Basically, Modbus Gateway will not change the Modus address in the data
packet of the protocol. When your automation software or device reports address
error, check that the address setting on the device is correct.
3. Proper character timeout configuration for Modbus/RTU
A Modbus/RTU device requires character timeout for data packet segmentation.
When a CRC error occurs, you may need to increase the character timeout in
Modbus Gateway.
4. HMI polling time and timeout interval issue
When [Attached Serial Device] is set to [Modbus/RTU Slave] or
[Modbus/ASCII Slave], each Modbus Gateway accepts up to 7 connections from
Modbus/TCP master devices. However, the Ethernet speed is much higher than
the Serial speed. Therefore, proper polling time and timeout interval settings are
required to prevent timeout error. For a particular HMI monitoring system, the
best configuration is: polling time set to 0.5 – 1.0 sec, Timeout interval 3 sec.
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6
6.Pin Assignments
NPort 6110 supports three serial interfaces: RS-232, RS-422, and 2-wire RS-485.
In this chapter, we give the DB9 Male pinouts for each of these three interfaces.
DB9 Male Pinouts
Pin No. RS-232
RS-422
RS-485
1
2
3
4
5
1
2
3
4
5
6
7
8
9
DCD
RxD
TxD
DTR
GND
DSR
RTS
CTS
---
TxD-(A)
TxD+(B)
RxD+(B)
RxD-(A)
GND
RTS-(A)
RTS+(B)
CTS+(B)
CTS-(A)
Data-(A)
Data+(B)
---
---
GND
---
---
---
---
6
7
8
9
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A
A.Declaration of Conformity
Manufacturer’s Name:
Moxa Technologies Co., Ltd.
Manufacturer’s Address:
Fl.4, No.135, Lane 235, Pao-Chiao Rd., Shing Tien
City, Taipei, Taiwan, R.O.C.
declares that the product:
Product Name:
Modbus Gateway
NPort 6110
Model Number:
conforms to the following standards:
EMC: FCC Class B
EN55022:1998 class B
EN61000-3-2:1995 class B
EN61000-3-3:1995
EN55082-1:1997
EN61000-4-2:1995
Contact Discharge 4kV, Air Discharge 8kV
EN61000-4-3:1995
EN61000-4-4:1995
AC/DC Power supply 1kV, Data/Signal lines 5kV
EN61000-4-5:1995
AC/DC Line to Line 1kV, AC/DC Line to Earth 2kV
EN61000-4-6:1995
EN61000-4-8:1993
3A/m at 50Hz
EN61000-4-11:1994
UL/CUL, TUV
EN60950
Safety
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B
B.Problem Report Form
NPort 6110 Modbus Gateway
Customer name:
Company:
Tel:
Fax:
Email:
Date:
1. Moxa Product: † NPort 6110 (1 RS-232/422/485 port)
2. Interface: † RS-232 † RS-422 † RS-485 (2-wire)
3. Attached serial device type:
† Modbus/ASCII
○ Master ○ Slave
† Modbus/RTU
○ Master ○ Slave
4. Serial Number: ___________
5. Firmware Version: ________________
6. Modbus Configurator Version: ________________
7. Problem Description: Please describe the symptoms as clearly as possible,
including all error messages. Be complete, since we may need to follow your
description to reproduce the symptoms.
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RETURN PROCEDURE
For product repair, exchange, or refund, the customer must:
♦
♦
Provide evidence of original purchase.
Obtain a Product Return Agreement (PRA) from the sales
representative or dealer.
♦
♦
Fill out the Problem Report Form (PRF). Include as much
detail as possible for a shorter product repair time.
Carefully pack the product in an anti-static package, and send
it, pre-paid, to the dealer. The PRA should be visible on the
outside of the package, and include a description of the
problem, along with the return address and telephone number
of a technical contact.
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