Generac G Panel (Stand Alone) (V3)
This topic is the install guide for after-market Gateway (part# A0009887841) with the GL899-PARTIAL POWER HARNESS (part# A0009887769), GL899-PARTIAL COMM HARNESS (part# A0009887770) and the GL899-COMM ACCESSORIES( part# A0009887771) utilizing the Generac G Panel (stand alone single generator application).

Modbus Communication Settings and Notes
Settings should correspond to the values in the table provided.
Address: 100 |
Baud Rate: 9600 |
Mode: Modbus Slave |
If different settings are required, please contact Support.
Equipment Connection Details
Generac Gateway Side Terminations | Description | Harness Wire Color | DTECH | DTECH | Equipment Side Terminations |
|---|---|---|---|---|---|
2 | DC+ | A0009887769 Red | NA | NA | TB1-1 |
1 | DC- | A0009887769 Black | NA | NA | TB1-2 |
8 | Data + | A0009887770 Orange / White | A | TXD/RXD+ or D+ | *2-RXD |
9 | Data - | A0009887770 White / Orange | B | TXD/RXD- or D- | *3-TXD |
10 | Data GND | A0009887770 Blue/ White | GND | NA | *5-GND |
Terminate communication wires at breakout board provided in harness accessory kit. Use breakout board cover to protect connections and secure to service port.
The DSE899 does not have an RS232 port, hence we need to use a DTECH DT-9000 RS232 to RS485 converter.
Gateway Connection Ports

Pin | Connector | Description |
1 | A | Plant Supply –ve |
2 | Plant Supply +ve | |
3 | Digital Output A | |
4 | Digital Output B | |
5 | Flexible Sender Common | |
6 | Flexible Sender A | |
7 | Flexible Sender B | |
1 | B
| RS485 A |
2 | RS485 B | |
3 | RS485 Screen | |
4 | CAN H | |
5 | CAN L | |
6 | CAN Screen |
Check out our knowledge base and support center for information on any technical questions.