CHAPTER 4: INTERFACES
G500 SUBSTATION GATEWAY INSTRUCTION MANUAL GE INFORMATION 45
For every port an Rx Termination Resistor of 120 Ohms can be enabled through the
software interface. This termination persists even when power is lost.
The pin assignment of the Serial Interfaces is dependent on the operation mode selected
for the interface:
Rx- Rx- D-
Rx+ Rx+ D+
Tx- Tx- -
GND GND GND
IRIG-B* IRIG-B* IRIG-B*
Tx+ Tx+ -
VCC** VCC** VCC**
- - -
The VCC (Pin 7) is available on port 4 and port 8 from the Built-in slots and port 4 of each
PCIe Expansion card installed in Expansion slots 1, 2 and 3. It is a 12V power output that is
limited to 6W. If a higher load is applied to the output the output shuts down.
The IRIG-B (Pin 5) is available on ports 1 through 8
of the Built-in slots and is not available
on any of the ports from the Expansion slots. The IRIG-B signal is a copy of the IRIG-B time
signal output on the rear of the system. This output can be used to synchronize external
equipment or other units to this unit. 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).
For interconnection of 2 G500 in 485-2W mode a standard 1:1 patch cable can be used.
For all
other modes a standard crossover is suitable.
Shielded twisted pair cables shall be used for wiring.
G500 v1.0 does not support IRIG-OUT.
High-voltage
installations
To provide higher EMC immunity and maintain CE Mark radiated emission compliance, the
serial cables used for permanent RS-232 and RS-485 connections must comply with the
following requirements:
• Cables must be shielded
• D-type connector covers must provide EMC shielding
(e.g. metalized plastic or die cast
metal covers).
EIA568 TIA/EIA 568A RJ45 Pinout RS232 RS422 RS485 4-Wire RS485 2-Wire
1Rx
2CTS
3Tx
4GND
5IRIG-B*
6RTS
7 VCC**
8DCD
*IRIG-B OUT Signal is allocated Hardware wise
but not functional in v1.0
**only on port 4 and 8
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