Layout

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1. RS-422/485 Port

The RS-422/485 port of the PES-2407 is a terminal block. It has six terminals and a 5mm pitch.

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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:

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3. LED

PES-2407 has 7 LEDs. Two of these are STS LEDs that indicate the status of the board. The one, on the top of the board, is connected to 3.3V and the other one, on the bottom of the board is connected to 5V. The rest five of them are LEDs indicating various states of serial communication. The operation and meanings of each LED are as follows:

Name Quantity Type Color Operation
STS 2 SMD Red ID setting is normal > Repeated on / off every 1 second
ID setting is incorrect > Fast flashing
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 enabling TxDE control > blinks when it sends data
disabling TxDE control > always on