Layout


layout_01

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.

layout_dsub

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:

layout_07

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