The Interface Solution Experts
29
THZ
2
&
TDZ
2
Programmable Smart HART
Temperature Transmitter and Display
HART Status Information
Each time the THZ
2
and TDZ
2
generate a response,
frame status information is included in the reply mes-
sage. The first byte indicates communications errors,
if any. Otherwise, if communication was good, this
byte may indicate the status of the received command
(such as
transmitter busy
or a
command not support-
ed)
. The second status byte indicates the operational
state of the slave device. A properly operating slave
device will have both status bytes set to logic zero.
The following tables include the common information
that is returned in every response message. However,
they do not detail the transmitter-specific
Additional
Status Information
that is returned in the data portion
of the response to
HART Command 48.
You may ac-
cess the
Additional Status Information
window via the
View
dropdown menu in the tool bar.
0
1
2
3
4
5
6
7
Undefined
Buffer Overflow
Reserved set to zero
Checksum Error
Framing Error
Overrun Error
Parity Error
This bit is always set when Communication errors occur
Table 6.
Communications Errors
Description
0
1
2
3
4
5
6
18
32
64
No command Errors
Undefined Error
Invalid selection
Passed Parameter too large
Passed Parameter too small
Too Few bytes received
Transmitter Specific Command Error
Invalid UOM Code
Transmitter Busy
Command not supported
Description
0x00
0x01
0x02
0x03
0x04
0x05
0x06
0x12
0x20
0x40
Bit 7 = 1
Bit 7 = 0
Bit
Value
Hex
Table 7.
Command Errors
