GE Multilin G100 - RS-485 Serial Connections

G100 Instruction Manual
GE Information
994-0155-1.00-1
51
EIA568
TIA/EIA
568A
RJ45 Pin
out
RS232
RS485
2-Wire
1 Rx D-
2 CTS D+
3 Tx -
4 GND GND
5 IRIG-B OUT IRIG-B OUT
6 RTS -
7 - -
8 DCD -
IRIG-B OUT is available only when an IRIG-B IN signal is connected. The G100 does not have an
internal IRIG-B signal generator.
The supported levels are compliant to TTL by a load of 120Ohm or higher. It is current limited and
protected against damage by short to GND (Pin 4).
Figure 8: Modular connector 8P8C (RJ45) pins
Shielded twisted pair cables shall be used for wiring.
RS-485 Serial Connections
The G100 can be configured to communicate with RS-232 or RS-485 2-wire type devices using the 4 Built-in
Serial Ports.
Each serial port can be independently configured through the Settings GUI. All port configurations persist
through a power cycle and when power is lost.
In RS-485 mode End of Link Termination (120 Ohm) can be enabled through the Settings GUI.
When enabled in Settings, End of Link Termination is active only when the device is powered on and
applications are running. This has no operational impact because the G100 is meant to act as a
master to other devices