Protech Systems BM-0947 User Manual page 17

2-4. COM PORT
COM1, COM5: COM Port, fixed as RS-232
PIN ASSIGNMENT
1 DCD#
2 RX
3 TX
4 DTR#
5 GND
COM2: COM2 Connector, selectable as RS-232/422/485
Co-lay with the other COM port stacked over COM1.
PIN
RS-232
1 DCD#
2 RX
3 TX
4 DTR#
5 GND
6 DSR#
7 RTS#
8 CTS#
9 RI#
BM-0947 USER ' S MANUAL
PIN ASSIGNMENT
6 DSR#
7 RTS#
8 CTS#
9 RI#
ASSIGNMENT
RS-422
TX-
TX+
RX+
RX-
GND
X
X
X
X
Chapter 2 Hardware Configuration
RS-485
RS-485-
RS-485+
X
X
GND
X
X
X
X
5
1
9
6
COM1/
COM5/
5
1
9
6
COM2
Page: 2-7