SNV Engineering SNV018EC.XX, Руководство пользователя и инструкция по установке

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S N V 0 1 8 E C . X X
U S E R & I N S T A L L A T I O N M A N U A L
V 3 . 1
© SNV Engineering Ltd
26
holding registers (MODBUS function 16)
Address
Type Description
dec hex
0 0x 00
Hi byte
Commands: “hold”(0x01) or “mark”(0x02) or
“change address”(0x0A)
Lo byte
if command is “change address”,
then set new target address
1 0x 01
Hi byte
if command is “change address”,
then set new target address
Lo byte
if command is “change address”,
then set new target address
Modbus package structure:
Implemented Modbus functions are described in the following tables.
CAUTION
Do not use functions 20 and 21.
SNV012EC.B - MODBUS Function (1)
Function SubFunction Data Length Values Description
1 (0x01) - Read Coils
SA_H 1 Byte 0x00 - 0xFF Starting Address Hi
SA_L 1 Byte 0x00 - 0xFF Starting Address Lo
QI_H 1 Byte 0x00 - 0x00 Quantity of Input Registers Hi
QI_L 1 Byte 0x00 - 0xFF Quantity of Input Registers Lo
Quantity: 1 to 2000 (0x07D0)