4

RS232 PORTS

The G308 has two RS232 ports. There is the PGM port and the COMMS port.

Although only one of these ports can be used for programming, both ports can

be used for communications with a PLC.

The RS232 ports can be used for either master or slave protocols with any

G308 configuration.

Examples of RS232 communications could involve another Red Lion product

or a PC. By using a cable with RJ12 ends on it, and a twist in the cable, RS232

communications with another G3 product or the Modular Controller can be

established. Red Lion part numbers for cables with a twist in them are

G3 RS232 to a PC

G308 PORT PIN OUTS

Connections

G3: RJ12

Name

PC: DB9

Name

4

COMM

1

DCD

5

Tx

2

Rx

2

Rx

3

Tx

N/C

4

DTR

3

COM

5

GND

N/C

6

DSR

1

CTS

7

RTS

6

RTS

8

CTS

N/C

9

RI

ETHERNET COMMUNICATIONS

Ethernet communications can be established at either 10 BASE-T or 100

BASE-TX. The G308 unit’s RJ45 jack is wired as a NIC (Network Interface

Card). For example, when wiring to a hub or switch use a straight-through

cable, but when connecting to another NIC use a crossover cable.

The Ethernet connector contains two LEDs. A yellow LED in the upper right,

and a bi-color green/amber LED in the upper left. The LEDs represent the

following statuses:

The Crimson manual contains additional information on Ethernet

communications.

LED COLOR

DESCRIPTION

YELLOW solid

Link established

YELLOW flashing Data being transferred

GREEN

10 BASE-T Communications

AMBER

100 BASE-TX Communications