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State
This field displays if the loop guard feature is enabled.
Status
This field displays if the port is blocked.
Loop Recovery
This field displays if the loop recovery feature is enabled.
Recovery
Time (min)
This field displays the recovery time for the loop recovery feature.
6.10.
Modbus
6.10.1.
Introduction
MODBUS TCP supports different types of data format for reading. The primary four types of
them are:
Data Access Type
Function
Code
Function Name
Note
Bit access
Physical Discrete
Inputs
2
Read Discrete Inputs
Not support now
Internal Bits or
Physical
Coils
1
Read Coils
Not support now
Word access
(16-bit
access)
Physical Input
Registers
4
Read Input Registers
Physical Output
Registers
3
Read Holding
Registers
Not support now
MODBUS Data Map and Information Interpretation of VIVOTEK IE Switches
MODBUS base address of VIVOTEK switches is 1001(decimal) for Function Code 4.
Address Offset Data Type
Interpretation
Description
System Information
0x0000
1 word
HEX
Vendor ID = 0x0b04
0x0001
16 words
ASCII
Vendor Name = “VIVOTEK Corp.”
Word 0 Hi byte = ‘V’
Word 0 Lo byte = ‘o’
Word 1 Hi byte = ‘l’
Word 1 Lo byte = ‘k’
Word 2 Hi byte = ‘t’
Word 2 Lo byte = ‘e’
Word 3 Hi byte = ‘k’
Word 3 Lo byte = ‘ ’
Word 4 Hi byte = ‘C’
Word 4 Lo byte = ‘o’
Word 5 Hi byte = ‘r’
Word 5 Lo byte = ‘p’