Generac Power Zone Pro (Sync) via RS485

This topic is the install guide for the after-market gateway (part# G0097460) with the universal harness (part# A0006648426) when utilizing Generac Power Zone Pro^® or Power Zone Pro Sync using the RS485 port.

Generac Power Zone Pro

Connect to Power Zone Gateway Ethernet port for programming and use Aux RS485 port for Modbus.

Modbus Communication Settings and Notes

Modbus connection to be made at the Aux RS485 port on the Power Zone Gateway (see image in previous section). Terminal block included in harness accessory kit if needed. To make changes to serial port, key switch must be in Off position.

To confirm the port settings in this table, follow the steps in this section.

Serial Port: RS485 Built In	Parity: None
Unit ID: 1	Stop Bits: 1
Baud rate: 9600	Mode: Modbus Gateway

For firmware version 1.21.9 and prior: Navigate to setup > Communications > Modbus Pass Thru. Modbus RTU Enable toggle must be selected and settings should match values provided in the table in this section.

For firmware version 1.22.1 or newer: Navigate to setup > Communications > External Interfaces > Configure > RS485 Built In. Confirm that settings match values provided in the table in this section.

If different settings are required, please contact Support.

It is recommended that firmware is updated to 1.23.2 or higher. An issue was identified with the Modbus RS485 port communications in previous versions.

Equipment Connection Details

Generac Gateway Side Terminations	Description	Harness Wire Color	Equipment Side Terminations
+	DC+	Red	B+
-	DC-	Black	B-
A2	Data +	Blue / White	A-12
B2	Data -	White / Blue	B-14
GND	Data GND	White / Green	SCR-11
Harness Relay #1	COM	Blue	2-Wire Start Typically (BS5) J5-5 DIN5
Harness Relay #1	N/O	White / Blue	2-Wire Start Typically (BS5) J5-5 DIN5