Wireless Sync Device
Model AT-MSX
Installation & User’s Guide
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Installation & User’s Guide
Operation
When connected to AC power, the AT-MSX automatically
powers up and an LED on the case bottom flashes 3 times then
begins flashing every 2 seconds indicating that the AT-MSX is
waiting to receive an AirTime radio signal. The LED will flash
brighter upon receipt of an AirTime signal. The AT-MSX will set
its internal clock to the exact time and the LED will flash every
second to indicate normal operation. The unit will transmit
the Lathem RS485 digital signal once per minute, to provide
time synchronization to other Lathem devices. It also closes
the dry relay contact for two (2) seconds once per day at 23
hours 59 minutes and 58 seconds to provide a synchronization
time reference signal to external third party devices such as an
intercom system.
Physical
The AT-MSX contains a microprocessor and UHF radio receiver
housed inside an impact resistant keyhole wall mount plastic
enclosure. The bottom of the enclosure features a five (5)
place removable terminal block connector for wiring to
external devices, a red LED signal reception indicator, four (4)
position program jumpers, and power port for an external AC
power adaptor.
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Installation & User’s Guide
Install Steps
Important: Before installing the AT-MSX, verify that an AirTime
Transceiver is installed and properly transmitting. You should
manually initiate the transmission of the AirTime signal by
pressing the TRANS button on the front of your transceiver.
1. Mount the AT-MSX within range of an AirTime transceiver’s
signal. It is important that the AT-MSX be mounted upright
as described to achieve maximum antenna reliability.
» After locating where the AT-MSX will be mounted, mark the
two spots for the mounting screws using the enclosed template.
» Drill a 5/16" hole at each mark
» Insert wall anchors and tap flush to the wall with the hammer.
» Insert both screws into wall anchors leaving 1/8" exposed.
» Align both keyholes on case back and slip over the two screws.
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Installation & User’s Guide
2. Pull and disconnect the removable terminal block and
connect the remote devices in the RS485 or Dry Sync
connecters. (IMPORTANT: RS485 requires proper polarity +
to +, - to -.) Once the connections are secure, reconnect
the removable terminal block.
Apply a minimum of 5.0 to 7.0 lb-in torque for tightening field
wires into the removable terminal block. Use Cat-3 or Cat-5
Twisted-Pair Wires. Use only Copper Wire.
3. Insert plug from AC power adapter into the Power In port.
4. Plug the power adapter into an 110vAC outlet.
5. The Status LED will flash once every two seconds. When the
signal is received, the LED will flash every second and the
AT-MSX will set its internal clock.
Page 3
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Installation & User’s Guide
Wiring Diagram
An AT-MSX correcting a Lathem RS485 device and/or a dry
contact device.
Specifications
Power:
6VDC/ 300 mA wall-mount
power supply. UL approved
Frequency
452 MHz
Channels
1x10 = 10
RS485 Connection
Relay Connection
Relay Rating
D - / D + terminal block
Terminal block
10 VA max / 0.5 A max switch
current
Dimensions
6.5” wide x 3.8” tall x 2” deep
0.6 pounds
Weight
Operating Temperature
0 ~ + 50’C
Page 4
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Installation & User’s Guide
Limited One-Year Limited Warranty
Lathem warrants the hardware products described in this guide against defects
in material and workmanship for a period of one year from date of original
purchase from Lathem or from an authorized Lathem reseller. The conditions
of this warranty and the extent of the responsibility of Lathem Time
Corporation (“Lathem”) under this warranty are listed below.
1. This warranty will become void when service performed by anyone other
than an approved Lathem warranty service dealer results in damage to the
product.
2. This warranty does not apply to any product which has been subject to abuse,
neglect, or accident, or which has had the serial number altered or removed,
or which has been connected, installed, adjusted, or repaired other than in
accordance with instructions furnished by Lathem.
3. This warranty does not cover dealer labor cost for removing and reinstalling
the machine for repair, or any expendable parts that are readily replaced due
to normal use.
4. The sole responsibility of Lathem under this warranty shall be limited to
repair of this product, or replacement thereof, at the sole discretion of Lathem.
5. If it becomes necessary to send the product or any defective part to Lathem
or any authorized service dealer, the product must be shipped in its original
carton or equivalent, fully insured with shipping charges prepaid. Lathem will
not assume any responsibility for any loss or damage incurred in shipping.
6. WARRANTY DISCLAIMER AND LIMITATION OF LIABILITY: Except only the
limited express warranty set forth above, the products are sold with no
expressed or implied warranties of any kind, and the implied warranties of
merchantability and fitness for a particular purpose are hereby expressly
disclaimed. No warranties are given with respect to products purchased other
than from Lathem or an authorized Lathem reseller and any such products are
purchased "as is, with all faults." In no event will Lathem be liable for any
direct, indirect, special, incidental or consequential damages arising out of or
in connection with the delivery, use or inability to use, or performance of this
product. In the event any limited remedy given herein shall be deemed to
have failed of its essential purpose, Lathem's maximum liability shall be to
refund the purchase price upon return of the product.
7. Proof of date of purchase from Lathem or an authorized Lathem reseller is
required for warranty service on this product.
8. This Warranty grants specific legal rights. Additional legal rights, which may
vary by locale, may also apply.
9. Should any difficulties arise with the performance of this product during
warranty, or with any Lathem authorized service centers, contact Lathem Time
at the following:
Lathem Inc
200 Selig Drive SW
Atlanta, GA 30336
Phone: 404-691-0405 Fax: 404-696-6048
Page 5
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