Table of Contents
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RUGGEDCOM ROS
User Guide
Function Code
CONTENTS
•
Section 1.7.1, "ModBus Function Codes"
•
Section 1.7.2, "ModBus Memory Map"
•
Section 1.7.3, "ModBus Memory Formats"
Section 1.7.1
ModBus Function Codes
RUGGEDCOM devices support the following ModBus function codes for device management through ModBus:
NOTE
While RUGGEDCOM devices have a variable number of ports, not all registers and bits apply to all
products.
Registers that are not applicable to a particular device return a zero (0) value. For example, registers
referring to serial ports are not applicable to RUGGEDCOM switch devices.
Read Input Registers or Read Holding Registers — 0x04 or 0x03
Example PDU Request
Function Code
Starting Address
Number of Input Registers
Example PDU Response
Function Code
Byte Count
Number of Input Registers
a
The number of input registers
Write Multiple Registers — 0x10
Example PDU Request
Function Code
Starting Address
Number of Input Registers
Byte Count
Registers Value
b
The number of input registers
ModBus Function Codes
Data
1 Byte
2 Bytes
2 Bytes
1 Byte
1 Byte
a
N
x 2 Bytes
1 Byte
2 Bytes
2 Bytes
1 Byte
b
N
x 2 Bytes
0x04(0x03)
0x0000 to 0xFFFF (Hexadecimal)
128 to 65535 (Decimal)
Bytes 0x0001 to 0x007D
0x04(0x03)
a
2 x N
0x10
0x0000 to 0xFFFF
Bytes 0x0001 to 0x0079
b
2 x N
Value of the register
Chapter 1
Introduction
15
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