2.2.5. COM
M!DGE3 provides serial interface COM terminated by 5 pin terminal connector. It can be configured
as RS232 or RS485.
RS232 of M!DGE3 is a hard-wired DCE (Data Communication Equipment) device. Equipment connected
to the serial port of M!DGE3 unit should be DTE (Data Terminal Equipment).
RS485 of M!DGE3 is not galvanic isolated and it is not terminated.
Tab. 2.3: COM pin description
COM – RS485
COM – RS232
Terminal
block
In/ Out
Signal
In/ Out
Signal
Pin
—
Out
CTS
1
—
In
RTS
2
In/Out
line B
Out
RxD
3
In/Out
line A
In
TxD
4
GND
GND
5
M!DGE3 keeps pin 6 DSR at the level of 0 (state ON, approx. +6.2 V) by RS232 standard permanently.
Expansion board 'C' (2 x RS232)
The 2nd and 3rd COM ports are available when the Expansion board 'C' (2 x RS232) is installed. In
such a case: The DI/DO connector is used as a connector for COM2 and COM3.
COM2 and COM3 parameters:
COM2: RS232 - 5 pin (RxD, TxD, GND, RTS, CTS) 600 b/s to 2 Mb/s
COM3: RS232 - 3 pin (RxD, TxD, GND) 2.4 kb/s to 921.6 kb/s
17
© RACOM s.r.o. – M!DGE3 Cellular Router
Product
