HRT-710 User Manual (Version 1.24, June/2015) PAGE: 20
3.3.5 Byte Count
It is the number of bytes between it and the check byte the end of
the HART frame.
3.3.6 Response Codes
It includes two bytes of status. These bytes convey three types of
information
:
Communication errors, Command response problems and
Field device status. They are shown as below.
[ First Byte ]
bit 7
:
1 (communication error)
bit 6
:
Parity error
bit 5
:
Overrun error
bit 4
:
Framing error
bit 3
:
Checksum error
bit 2
:
0(reserved)
bit 1
:
Rx buffer overflow
bit 0
:
Overflow (undefined)
[ bit 7=0 (Comm. OK) ; Bit 0~6: as an integer, not bit-mapped ]
0
:
No command-specific error
1
:
(undefined)
2
:
Invalid selection
3
:
Passed parameter too large
4
:
Passed parameter too small
5
:
Too few data bytes received
6
:
Device-specific command error (rarely used)
7
:
In write-protect mode
8-15
:
Multiple meanings
16
:
Access restricted
28
:
Multiple meanings
32
:
Device is busy
64
:
Command not implemented
[ Second Byte - Field device status ]
bit 7
:
Field device malfunction
bit 6
:
Configuration changed
bit 5
:
Cold start
bit 4
:
More status available
bit 3
:
Analog output current fixed
bit 2
:
Analog output saturated
bit 1
:
Non-primary variable out of limits
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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