RayTek MI3, Operating Instructions Manual

Page: 90 / 119

Modbus
90
Rev. F1 05/2013
MI3
15.2 Programming
Functions codes and start addresses are listed in decimal.
15.2.1 Supported Functions
Function code Modbus Function Description
01 Read Coils Read n bits
02 Read Discrete Inputs Read n bits
03 Read Holding Registers Read n 16 bit words
04 Read Input Registers Read n 16 bit words
06 Write Single Register Write a 16 bit word
16 Write Multiple Registers Write n 16 bit words
15.2.2 Parameter Data
32 bit registers are transmitted in full Big-Endian mode, meaning most significant word is transmitted
first, least significant word is transmitted last. The byte order within a word is Big-Endian as well.
While some registers hold integer values, there are some holding floating points. The interchange
formats of the IEEE-754 standard for Floating-Point Arithmetic is used for representing floating
points.
The following table lists all parameters, its content, their formats and usage.
15.2.2.1 Box Parameter
<k> … number of output channel, depending on the number of physically installed output channels of
the Comm Box.
Items (registers, discretes or coils) are addressed starting at zero. Therefore items numbered 1-10000
are addressed as 0-9999.
Start
address
Size
[bits]
Modbus Access Data
Type
Content Values MI3[M]
command
1 16 input register short error code for last
request
0: no error
1: value out of range
2: illegal head number
3: illegal analog output number
4: illegal output mode
5: output disabled error
99: unspecified error
-
10 64 input register hex Serial number e.g. 98123 XV
20 64 input register string Unit identification e.g. MI3COMM XU
30 64 input register string Box Firmware Revision e.g. 2.10 XR
40 16 input register short Modbus slave address 1 .. 247 XA
50 32 input register string Box special e.g. RAY, LAS DS
60 32 holding register integer Baud rate RS485 9600, 19200, 38400, 57600, 115200 BR
70 16 holding register char Temperature Unit 0x43 ('C'), 0x46 ('F') U
80 32 input register float Box Temperature XJ
90 16 holding register short Switch panel lock 0: unlocked, 1: locked J
1.800.868.7495 info@Raytek-Direct.ca