Operator Panel

RS422/485 COMMS PORT
The G303 has one RS422/485 port. This port can be configured to act as
either RS422 or RS485.
The RS422/485 COMMS and RS232 COMMS ports are multiplexed
because they share the same hardware. Both COMMS ports can be used with
master protocols. However, when the RS422/485 COMMS port is used with a
slave protocol, the RS232 COMMS port is not available.
Note: All Red Lion devices connect A to A and B to B, except for
Paradigm devices. Refer to www.redlion.net for additional information.
5
POWER
CONNECTOR
24V 20%2 COMMON1
+
N/C3
-
(NIC)
ETHERNET
RS232RS485RS232
PGM PORT
PORT
COMMSCOMMS
PORT
USB
TYPE B
CTS (PIN 1) RTS (PIN 6) TxB (PIN 1) COMM Tx COMM Rx COMM CTS (PIN 1) TxA (PIN 8) RxA TxB TxEN RxB COMM TxA COMM Rx
RTS (PIN 6) Tx
GREEN AMBER LED YELLOW LED
PROTECTIVE
EARTH
GROUND
G303 PORT PIN OUTS
Examples of RS485 2-Wire Connections
G3 to Red Lion RJ11 (CBLRLC00)
DLC, IAMS, ITMS, PAXCDC4C
A+4TxA2
B-5TxB1
COMM3COMM6
TxEN2TxEN5
NameRLC: RJ11NameG3: RJ45
Connections
G3 to Modular Controller (CBLRLC05)
TxA8TxA8
TxB7TxB7
COMM6COMM6
TxEN5TxEN5
RxA
TxA
3,2
2,3
RxA
TxA
3,2
2,3
RxB4,1RxB4,1
TxB1,4TxB1,4
NameModular ControllerNameG3
Connections
TX
5V
8
1
7
2
TxB
TxA
130K
130K
5
TxEN (OC)
RX
130K
5V
130K
RxB
4
RxA
3
GND
6
TxEN (OC)
TX/RX
130K
5
TxA
2
8
130K
5V
7
1
TxB
6 GND
RS422/485 4-WIRE
CONNECTIONS
RS485 2-WIRE
CONNECTIONS