H685 4G Variants - Terminal block Information and Installation
The H685 router includes a 10-pin pluggable terminal block, pre-fitted to the unit. It provides an alternative power input and exposes serial, I/O, and reset pins for integration into industrial installations.
Terminal block specifications
| Parameter | Value |
|---|---|
| Pin spacing | 3.81 mm |
| Number of pins | 10 |
| Wire gauge | 14–24 AWG |
Pin assignments
| Pin | Signal | Description | Notes |
|---|---|---|---|
| 1 | VCC | +7–30 V DC power input | Typical operating current: 12 V / 1 A |
| 2 | GND | Ground | Power return — connect before VCC |
| 3 | TX | Transmit data (serial) | — |
| 4 | RX | Receive data (serial) | — |
| 5 | PGND | Ground | — |
| 6 | RST | Reset | Short RST to GND for 1 second to reboot; 3 seconds for factory reset. See Restore Router to Default Factory Settings. |
| 7 | DIO0 | General purpose I/O | — |
| 8 | DIO1 | General purpose I/O | — |
| 9 | NC / DIO2 | Not connected | Reserved for DIO2 |
| 10 | NC / DIO3 | Not connected | Reserved for DIO3 |
Warning: Verify polarity before applying power. Pin 1 is VCC (positive) and Pin 2 is GND. Reversing polarity will damage the router.
Wiring the terminal block
- Ensure the router is disconnected from power before wiring
- Remove the terminal block from the router by gently pulling it straight out
- Use a small flat-head screwdriver to open a terminal: turn the screw anti-clockwise
- Insert the stripped wire end into the terminal
- Secure the wire by turning the screw clockwise
- Repeat for each connection required
- Reinsert the terminal block into the router
Before switching on, double-check that VCC and GND are connected to the correct pins. Incorrect wiring can permanently damage the equipment.