Command Errors; Figure 5.2 Multiple Ppt Network Command And Replies - Honeywell PPT User Manual

Computer
or Host
Processor
Command (1)
*01T1
*02WE
*02DU=mmhg
*02DU
*92DU
*91P1
*91CK
*99we
*99bp=n19200
*99RS= =
*99WE
*99sp=all
*99P1
(1) See Table 5.3 for types of sequential response commands.
– Indicates there is no reply for this timing location
5.8

COMMAND ERRORS

For RS-232 ring configuration, if the host processor receives a PPT reply with a '*' header character,
this indicates one of three conditions.
1. If the reply is exactly the same as the command sent, and the command was not sent to a
group or global address (90 to 99), then the command has been rejected due to an incorrect
header, address number, command code or action character.
This error is common if an incorrect command code format was used or if the command
should have been preceded by a write enable (WE, NE) command and was not.
If the command was rejected because of an incorrect command code or action character, an
error indicator is set which can be read and cleared with the Read Status (RS) command.
2. If the command was a group or global command, then the reply should contain the *90.. to
*99.. command sent. (The command should contain a 9 as the first digit of the group or global
address.) This reply indicates to the host processor the command has been delivered to all
addressed units in the network. This indicates an error only if the reply does not contain the
command sent.
3. The command stream has been aborted by the sending host processor.
NOTE: A Read Status command is used to determine the error condition and clear the error status. (See
Read Status command description for error conditions.)
PPT
CMD
ID=01
T
Group=91
A
B C
R
Reply A
#01CT=25.4
–
–
#02DU=MMHG
#02DU=MMHG
#01CP=1.024
*91CK
*99WE
*99BP=N19200
#01RS=0000
*99WE
*99SP=ALL
#01CP=1.274
Figure 5.2—Multiple PPT Network Command and Replies
PPT
PPT
ID=02 ID=03
Group=91 Group=93
D
Reply B Reply C
–
–
–
–
*92DU
#03CP=15.25
#01CK=OK #03CK=OK
–
–
#02RS=010+ #03RS=000-
–
–
#02CP=12.498 #03CP=-.00004
3 5
T - RS-232 Transmit
R - RS-232 Receive
Reply D
– –
– –
– –
– –
– –
*91P1 –
–
– –
– –
*99RS= =
– –
– –
*99P1