Serial Communication – Rs232/485 - Honeywell Cloud Link 4G Modem User Manual

4 Electrical Assembly
4.2 Serial Communication – RS232/485
4.2 Serial Communication – RS232/485
Cloud Link 4G Modem as a transparent cellular modem supports traditional RS232/RS485 interface (only
one at a time). You can select either RS232 or RS485 by adjusting the position of the switch provided on
the device.
Pin# Name
1 Gnd
2 RS232 Tx (or)
RS485 A
3 RS232 Rx (or)
RS485 B
4 RS232 RTS
5 RS232 CTS
Honeywell
2016
Description
Ground
RS232 Mode: Transmit Line
RS485 Mode: Non-inverting Driver
Output and Non-inverting Receiver
Input
RS232 Mode: Receive Line
RS485 Mode: Inverting Driver Output
and Inverting Receiver Input
RS232 Mode: Request To Send (RTS)
RS485 Mode: NC (No Connection)
RS232 Mode: Clear To Send (CTS)
RS485 Mode: NC (No Connection)
I/O Voltage Levels
Ground
O
+/- 3.7V (Min)
+/-4V (Typ)
I/O Diff Driver Output:
2.7V (typ)
I +/- 10V (max)
I/O Diff Driver Output:
2.7V (typ)
O +/- 3.7V (Min)
I +/- 10V (max)
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