Communication Examples - ABB COMMANDER 300 Operating Instructions Manual

8.4

Communication Examples

The following examples show typical master-to-slave transmissions and the subsequent slave-
to-master replies. For
a)
Command – STX
STX R 06 PB ETX
Proportional band
Controller number six
'Read' command
Start of text
Reply – 06PB100.0
06 PB 100.0 ACK
Proportional band is 100%
Controller number 06
b)
Command – STX
STX R 07 IX ETX
Parameter 'IX'
Controller number seven
'Read' command
Start of text
Reply – 0702 NAK
07 02 NAK
Command not understood
Error code 2
Controller number seven
i.e. 'IX' in the original command is not a
recognised 'Read' parameter – see
Section 8.6.
and
Error Code Parameter
R06PB E E TX
End of text
ACK
Command understood
R07IX E E TX
End of text
8 COMMUNICATION...
interpretations refer to Sections 8.5 and 8.6.
c) Command –
STX
STX M 05 MG ETX
Multiple read mnemonic
Controller number five
'Multiple Read' command
Start of text
Reply:
Controller number 5
Command understood
05 MV 60.0 ACK ETB
05 IS 0 ETB
05 SP 65.0 ACK ETB
05 OP 72.5 ACK ETB ACK
ACK
End of transmission block
* '0' is the normal status – see Fig. 8.7
overleaf.
d) Command –
STX
STX M 05 MV ETX
Measured (process) Variable
Controller number five
'Multiple Read' command
Start of text
Reply – 0519 N N AK
05 19 NAK
Command not understood
Error code 19
Controller number five
i.e. the 'Multiple Read' command cannot
be used for a single parameter – see
Section 8.6.
M05 MG E E TX
End of text
Measured value 60.0
Instrument status 0 *
Control setpoint 65.0
Control output 72.5%
M05MV ETX
End of text
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