Lathem AirTime AT MSX User Manual

Wireless Sync Device  
Model AT-MSX  
Installation & User’s Guide  
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.  
Page 1  
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.  
Page 2  
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  
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  
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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