Laurel Electronics LAUREATE SERIES Serial Comunications User Manual
Page 4
1.2
RS232 AND RS485 WIRING CONNECTIONS
The cable connections to an IBM PC-compatible computer are different for RS232 and RS485.
The RS232 cable connections at the computer end may interface with either a 25-pin
or a 9-pin subminiature D connector. Both are commonly used and have pin connec-
tions as shown below.
RS - 232 INTERFACE - J3A
N/C
ISO GROUND
RX
TX
RTS
N/C
6
5
4
3
2
1
9-PIN SUBMINIATURE
D CONNECTOR
5 GROUND
3
TRANSMIT
2
RECEIVE
7
RTS
RS - 232 INTERFACE - J3A
N/C
ISO GROUND
RX
TX
RTS
N/C
6
5
4
3
2
1
25-PIN SUBMINIATURE
D CONNECTOR
7 GROUND
2
TRANSMIT
3
RECEIVE
4
RTS
Note: The IBM computer normally has male RS-232 connectors so the modular adapter should
have a female connector.
RS - 485 INTERFACE - J3A & J3B
FULL DUPLEX
ISO GROUND
BRX
ARX
ATX
BTX
ISO GROUND
6
5
4
3
2
1
IBM COMPUTER
3 GROUND
2 DATA OUT +
7 DATA OUT -
8 DATA IN -
4 DATA IN +
3 GROUND
9-PIN SUBMINIATURE
D CONNECTOR
-3-
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