Table of Contents
1.
Introduction ......................................................................................................................... 6
1.1
Features..........................................................................................................................7
1.2
Modbus Function Code Support .....................................................................................8
1.3
Specifications ..................................................................................................................8
2.
Hardware............................................................................................................................ 10
2.1
Block Diagram............................................................................................................... 10
2.2
Pin Assignment ............................................................................................................. 10
2.3
Wiring............................................................................................................................ 13
2.3.1
RS-232 Wiring ........................................................................................................ 13
2.3.2
RS-485 Wiring ........................................................................................................ 13
2.3.3
RS-422 Wiring ........................................................................................................ 14
2.3.4
HART Wiring........................................................................................................... 14
2.4
LED indicator ................................................................................................................ 18
2.5
DIP Switch .................................................................................................................... 19
2.5.1
The default values in the “Default” mode................................................................ 20
2.6
Jumper .......................................................................................................................... 21
2.7
Module Loop Power Wiring (HRT-310) ......................................................................... 22
3.
HART Introduction ............................................................................................................ 23
3.1
Analog and Digital signal............................................................................................... 23
3.2
Network topology .......................................................................................................... 24
3.3
HART Frame ................................................................................................................. 26
3.3.1
Preamble ................................................................................................................ 26
3.3.2
Delimiter ................................................................................................................. 26
3.3.3
Address .................................................................................................................. 26
3.3.4
Command............................................................................................................... 26
3.3.5
Byte Count.............................................................................................................. 27
3.3.6
Response Codes .................................................................................................... 27
3.3.7
Data........................................................................................................................ 28
3.3.8
Check Byte ............................................................................................................. 28
4.
Modbus Communication .................................................................................................. 29
HRT-710 / HRT-310 User Manual
Version 1.31
Page
：
2
Copyright © 2017 ICP DAS Co., Ltd. All Rights Reserved E-mail: [email protected]