Honeywell Cloud Link 4G Modem, Руководство пользователя, Страница: 24 / 71

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 Description I/O Voltage Levels
1 Gnd Ground Ground
2 RS232 Tx (or)
RS485 A RS232 Mode: Transmit Line O
+/- 3.7V (Min)
+/-4V (Typ)
RS485 Mode: Non-inverting Driver
Output and Non-inverting Receiver
Input I/O Diff Driver Output:
2.7V (typ)
3 RS232 Rx (or)
RS485 B RS232 Mode: Receive Line I +/- 10V (max)
RS485 Mode: Inverting Driver Output
and Inverting Receiver Input I/O Diff Driver Output:
2.7V (typ)
4 RS232 RTS RS232 Mode: Request To Send (RTS) O +/- 3.7V (Min)
RS485 Mode: NC (No Connection)
5 RS232 CTS RS232 Mode: Clear To Send (CTS) I +/- 10V (max)
RS485 Mode: NC (No Connection)
4 Electrical Assembly
4.2 Serial Communication – RS232/485
Honeywell
2016
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