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Supported Commands
0x01 Read Coils
0x03 Read Multiple Registers
0x05 Write Single Coil
0x06 Write Single Register
0x15 Write Multiple Coils
A request to use a function that is not available will return an illegal function error (0x01).
Register Types
Data registers are 16 bits wide with addresses using the standard MODICON protocol. Floating point values
use the standard IEEE 32-bit format occupying two contiguous 16 bit registers. ASCII values are stored with
two characters (bytes) per register in hexadecimal format. Coil registers are single bit values which control
and indicate the status of a relay; 1 = on, 0 = off.
MODBUS Coil Registers
Parameter
Relay 1 (Forward)
Relay 2 (Reverse)
A request to read or write coils that are not available will return an illegal address error (0x02.)
MODBUS Holding Registers
Parameter
Address
Serial#
DOM
HW Version
FW Version
Timeout (seconds)
Relay Closure Count
A request to read or write a register that is not available will return an illegal address error (0x02).
11
Description
Device Slave Address
Device Serial Number
Date of Manufacture
Hardware Version
Firmware Version
Turn off relays if no communication
Relay 1
Relay 2
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Range
Type
1 - 247
8 bit
ASCII
8 char
ASCII
8 char
ASCII
8 char
ASCII
8 char
0 - 32767
16 bit, unsigned
Unsigned Int
32 bit, unsigned
Access
Address
R/W
1
R/W
2
Access
Address
R/W
40001
R
40004
R
40008
R
40012
R
40016
R/W
41001
R
49001
49003