Layout
1. RS-422/485 Port
The RS-422/485 port of this board is a terminal block. It has six terminals and a 5mm pitch.
RS-422
| Number | Name | Description | Level | I/O | Wiring |
|---|---|---|---|---|---|
| 1 | TX+ | Transmit Data+ | RS-422 | Out | Required |
| 2 | TX- | Transmit Data- | RS-422 | Out | Required |
| 3 | GND | Ground | Ground | - | Required |
| 4 | RX+ | Receive Data+ | RS-422 | In | Required |
| 5 | RX- | Receive Data- | RS-422 | In | Required |
| 6 | GND | Ground | Ground | - | Required |
RS-485
| Number | Name | Description | Level | I/O | Wiring |
|---|---|---|---|---|---|
| 1 | TRX+ | Transmit / Receive Data+ | RS-485 | In/Out | Required |
| 2 | TRX- | Transmit / Receive Data- | RS-485 | In/Out | Required |
| 3 | GND | Ground | Ground | - | Required |
| 6 | GND | Ground | Ground | - | Required |
2. SLAVE ID Switch
A slave ID is used when PHPoC board identifies each smart expansion board. So, each smart expansion board, which is connected to a PHPoC board, should have a unique slave ID. The slave ID can be set one of the numbers from 1 to 14 by 4 DIP switches as follows:
3. LED
This board has 6 LEDs.
| Name | Quantity | Type | Color | Operation |
|---|---|---|---|---|
| STS | 1 | SMD | red | ID setting is normal > repeats on / off every 1 second ID setting is incorrect > blinks fast |
| TX | 2 | DIP, SMD | green | blinks when sending data to the serial port |
| RX | 2 | DIP, SMD | yellow | blinks when receiving data to the serial port |
| TXDE | 1 | SMD | green | TxDE enabled > blinks while sending data TxDE disabled > ON |