> ## Documentation Index
> Fetch the complete documentation index at: https://learning.kent.co.in/llms.txt
> Use this file to discover all available pages before exploring further.

# Kent G3 Communications, Parallel Wiring, and DRM Port

> COM port routing map, communication terminal assignments, parallel rules for up to 6 identical units, DIP switch positions, DRM port, and datalogger.

The Kent G3's communication side determines how the unit talks to its battery, to a grid meter, to other inverters in a parallel fleet, and to the Kent monitoring system. Get the cable routes, terminal assignments, and DIP positions right before commissioning.

<Warning>
  **For trained and authorized installers only.**
</Warning>

## COM Ports

| Port        | Type                 | Used for                                           |
| ----------- | -------------------- | -------------------------------------------------- |
| COM1        | USB                  | Datalogger stick **only**                          |
| COM2 / COM3 | 4-hole glands, Ø6 mm | RJ45 runs: BMS, meter, parallel bus                |
| COM4 / COM5 | 6-hole glands, Ø2 mm | 16-pin terminal-block wires (CTs, G-V dry contact) |

Keep all unused gland holes plugged with their watertight caps. The COM2/COM3 fastening rings open at the side — feed cables in through the side openings, not straight through the gland face.

## Communication Terminals

| Terminal                               | Function                                                       |
| -------------------------------------- | -------------------------------------------------------------- |
| METER (RJ45)                           | Meter RS485 — A on pin 1, B on pin 2                           |
| BMS (RJ45)                             | Battery CAN — CAN-H pin 4, CAN-L pin 5 (RS485A pin 6, B pin 3) |
| RS485 (RJ45)                           | Third-party external devices                                   |
| DRM (RJ45)                             | Remote shutdown / demand response (optional)                   |
| P-A / P-B                              | Parallel bus connection points                                 |
| L1CT / L2CT / L3CT                     | CT inputs on the 16-pin block                                  |
| GEN-V (pins 8/9)                       | Generator start — voltage-free dry contact                     |
| ATS, GEN-S, GEN-DI, GND-DI, HS/HG pins | Reserved — do not wire without written Kent guidance           |

BMS pinout and the Kent battery 4-5 crossover cable rule are covered on [Battery Wiring](/g3/battery-wiring).

## Parallel Systems — The Rules

<CardGroup cols={2}>
  <Card title="Unit limit" icon="layer-group">
    Up to **6 identical units**. Never parallel different models — a 12 kW and a 15 kW cannot share a bus.
  </Card>

  <Card title="Bus cable" icon="cable-car">
    Chain **P-A / P-B** with shielded CAT5. Maximum **5 m between adjacent units**.
  </Card>

  <Card title="DIP switch" icon="toggle-on">
    Both DIP pins ON at the **first and last** inverter in the chain. OFF on all middle units.
  </Card>

  <Card title="Battery bank" icon="battery-full">
    One shared battery bank for the whole fleet. BMS connects to the **master inverter only**.
  </Card>
</CardGroup>

* Set addresses on the HMI: **master = 1** (mandatory), slaves 2, 3, 4, 5, 6. Address 0 is never used.
* **Every unit must have its own datalogger stick.** Without it, remote fleet firmware upgrades are impossible.
* All paralleled units must share one ground point — see [Earthing](/g3/earthing).

## DRM Port (Optional)

<Note>
  RJ45 pins **5 and 6**: shorted together = inverter generates normally. Open = inverter shuts down within 5 s. This is a hidden cause of "inverter won't start" on sites where someone wired the DRM port and the connection has been lost or was never shorted. Check it early in fault-finding.
</Note>

## Datalogger

The USB port (COM1) accepts the approved Kent datalogger stick only — no other device. Keep the dust cover on when the stick is not fitted. Fit the stick physically during installation. Activation is done with Kent Central Command — documentation to follow.

## Common Mistakes

* DIP pins left OFF at both chain ends — or ON in the middle units — causes intermittent parallel faults that are hard to trace.
* A 12 kW and 15 kW unit paralleled "temporarily" — unsupported and will not operate correctly.
* One datalogger shared across a 4-unit array — remote upgrade of the other three units is impossible.
* Something other than the datalogger (phone charger, USB drive) plugged into the USB COM port.

## Related Pages

* [Kent G3 Battery Wiring](/g3/battery-wiring)
* [Kent G3 Commissioning](/g3/commissioning)
* [Kent G3 GEN & Smart Port](/g3/gen-and-smart-port)