Com Port And Connectors (Com1-Com6) - Protech Systems BU-2509 User Manual

2-4. COM PORT and CONNECTORS
COM1: COM1 Connector, fixed as RS-232.
PIN ASSIGNMENT
1 DCD#
2 RX
3 TX
4 DTR#
5 GND
6 DSR#
7 RTS#
8 CTS#
9 RI#
COM2: COM2 Connector selectable as RS-232/422/485.
The pin assignments are as follows:
PIN
RS-232
10 DCD#
11 RX
12 TX
13 DTR#
14 GND
15 DSR#
16 RTS#
17 CTS#
18 RI#

BU-2509 USER S MANUAL
Signal
RS-422 RS-485
TX- RS-485-
TX+ RS-485+
RX+ NC
RX- NC
GND GND
NC NC
NC NC
NC NC
NC NC
Chapter 2 Hardware Configuration
COM2/
COM1
Page: 2-8