Rs-232 Port - Allen-Bradley 2755-LS7-SB User Manual

B–4 Cable Pinouts
Publication 2755-6.9

RS-232 Port

13
25
Pin Signal
1 GND
2 TXD
3 RXD
RTS, TXD, or
4
RS-485 Enable
5 CTS or RXD
6 Output
7 GND
8 Output
9 5 Volts
10 Input
11 Input
12 Not Used
13 RXB+
14 TXA–
15 Output
16 RXA–
17 Common
18 Not Used
19 TXB+
20 Not Used
21 Not Used
22 GND
23 Not Used
24 Not Used
25 Input
1
14
Function
Chassis ground
Reader transmits data to host device.
Reader receives data from the host device.
Host RS-232 RTS or under software control aux RS-232
TXD, or RS-485 transmitter enable.
Host RS-232 CTS or under software control aux RS-232
RXD.
TTL relay output (5V dc @ 2 mA). Sink is 10 mA and
source is 2 mA.
Signal ground
TTL relay output (5V dc @ 2 mA). Sink is 10 mA and
source is 2 mA.
5 V
Trigger input; same as pin 1 of trigger connector.
Default configuration pin goes to pin 8 of the reader
connector and the default switch.
No connection
Reader receives data from the host device in RS-485 and
RS-422 modes.
Reader transmits data to host device.
Relay contact normally open
Reader receives data from the host device in RS-485 and
RS-422 modes.
Common
No connection
Reader transmits data to host device in RS-485 and
RS-422 modes.
No connection
No connection
Ground
No connection
No connection
New Master input to pin 12 of the reader connector and
New Master button.