HRT-710 User Manual (Version 1.24, June/2015) PAGE: 83
So the data of HART command 1 is parsed as below.
Response code1 = 0x00
Response code2 = 0x00
Primary Variable Unit code = 0x0C (kPA)
Primary Variable = 0x3E 0xC5 0x20 0xA4 (0.385 => IEEE754)
Q06 : How to read HART device CMD 3 data with standard
format by Modbus ?
A06:
(1) When adding a new HART device to HRT-
710, the ―Default CMD(3)‖ will be added
automatically. The Modbus start address and length
of the ―Default CMD(3)‖ will show in
the ―
Cmd In address
‖ and ―
Cmd In size
‖ field like Figure 6-1. In the example they are
1236 (For MB Addr = 618 = 0x026A) and 26 (byte count=26 => word count=13).
Figure 6-
1 ―Default CMD(3)‖ of HART device in HRT-710
(2) The below demo will use the free
MB/RTU tool
provided by ICP DAS to show HART
command 1 data. (Download from
http://ftp.icpdas.com.tw/pub/cd/8000cd/napdos/modbus/modbus_utility/
)
(3) Run ―MB/RTU‖ tool. Set the com port settings the same with HART-710 (Baud Rate /
Data Bits / Stop Bits / Parity) and then click ―Open‖ button to connect to HRT-710 like
Figure 6-2.
(4) Input ―
01 04 02 6A 00 0D
‖ in ―Command‖ field and click ‖Send Command‖ button to
se
nd the modbus command. The HART command 3 data will be received in ―Responses‖
field => ―
01 04 1A 00 00 A1 41 22 01 3E 0C C5 C5 20 B0 B6 41 C0 78 42 39 91 C9 00 C5
00 00 00 00 E5 B0
‖ like Figure 6-2.
Содержание HRT-710
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Страница 32: ...HRT 710 User Manual Version 1 24 June 2015 PAGE 32 Figure 23 MBRTU send and receive data...
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