HIM
28
The Interface Solution Experts
Smart HART
Loop
Interface and Monitor
HART Status Information
The following tables describe HART status information.
0
1
2
3
4
5
6
0
1
2
3
4
5
6
7
8-15
16
28
32
64
Bit 7 = 1
Communications
Error
(The byte consists
of error FLAGS)
Bit 7 = 0
Command Response
(T
(The byte is a numerical value repre-
senting a single error condition)
Bit/Code
Description
0 (undefined)
RX buffer overflow
0 (reserved)
Checksum error
Framing error
Overrun error
Parity error
No error
Undefined
Invalid selection
Passed parameter too large
Passed parameter too small
Too few bytes received
Device specific command error
In write protect mode
Multiple meanings
Access restricted
Multiple meanings
Device is busy
Command not implemented
MSB
Table 4.
MSB: HART First Byte
0
1
2
3
4
5
6
7
0 not used when
a communications
error exists
Bit
Description
Primary variable out of limits
Non primary variable out of limits
Analog output saturated
Analog output current fixed
More status available
Cold start
Configuration changed
Field device malfunction
LSB
Table 5.
LSB: HART Second Byte
