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MiniCapt® Mobile Operations Manual
A-1
Appendix A
Communications
Communications with the MiniCapt are available via Modbus TCP. The instrument
presents a single TCP/IP Ethernet connection at port 502 using the standard Modbus
protocol.
Two specification documents were used in the development of the Modbus interface:
•
MODBUS MESSAGING ON TCP/IP IMPLEMENTATION GUIDE V1.0b
•
MODBUS APPLICATION PROTOCOL SPECIFICATION V1.1b
The Modbus protocol, as implemented in this instrument, utilizes generic 0-based
addressing.
Modbus Overview
Each register in the Modbus map is defined to be 16 bits. The map can contain three
distinct sections:
1 Input registers
Read Only information for ID and data collection
2 Holding registers
Read/Write parameters for configuring the device
3 Coils
Read/Write individual bits to control the device
The supported functions include:
1
Read Coils
3
Read Holding Registers
4
Read Input Registers
5
Write Single Coil
6
Write Single Holding Register
15
Write Multiple Coils
16
Write Multiple Holding Registers
22
Mask Write Holding Register
23
Read/Write Multiple Holding Registers
Содержание PARTICLE MEASURING SYSTEMS MiniCapt
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