User manual

B&B Electronics, Inc. SPECTRE User Manual
32
SPECTRE_User_Manual_2912m
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Typical connection of the I/O port circuits:
Fig. 29: Connection of the I/O Port circuitry
The I/O Port registers are read and written using MODBUS ASCII slave protocol over serial
port 1. Using this protocol, it is possible to configure the I/O board, read the input status, and control
the output. The I/O port communicates at 9600 baud, 8 bits, no parity, and 1 stop bit (8N1).
Address space
Address
Access
Description
0x0000
R/-
Firmware type
0x0001
R/-
Upper 16 bits of firmware version
0x0002
R/-
Lower 16 bits of firmware version
0x0003
R/-
Supports firmware characteristics
bit 0 – Analog input AN1
bit 1 – Analog input AN2
bit 2 – Counter input CNT1
bit 3 – Counter input CNT2
bit 4 – Binary input BIN1
bit 5 – Binary input BIN2
bit 6 – Binary input BIN3
bit 7 – Binary input BIN4