ICP DAS USA HRT-710, User Manual

Page: 82 / 104

HRT-710 User Manual (Version 1.24, June/2015) PAGE: 82
Figure 5-2 Receive HART Command 1 data
(5) Parse the modbus response data.
Response Data => 01 04 08
00 00 3E 0C 20 C5 00 A4 2A 94
Register data => 00 00 3E 0C 20 C5 00 A4
Because the unit of HART-
710’s database is byte and the unit of Modbus register is word
and the Modbus register is compos
ed of database’s byte and the order is low byte first.
(For example : Modbus register0 = 0x3412, database byte0 = 0x12, byte1 = 0x34).
So we need to change the byte order.
So the data will be
00 00 0C 3E C5 20 A4 00.
According to the data count is 7, so the actual data will be 00 00 0C 3E C5 20 A4
About the format of HART Command 1, it is shown as below.
Command 1: Read Primary Variable
Request data bytes : None
Response data bytes : 2+5 = 7
Index format description
Byte 0
: uint8 Response code 1
Byte 1 : uint8 Response code 2
Byte 2 : uint8 Unit code
Byte 3~6 : float Primary Variable