Am key usage, Scan table, Error response – West Control Solutions N6600 User Manual
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5.3.8.3 AM KEY USAGE {P} = h
This parameter, which may be interrogated only using a Type 2 message,
indicates the usage selected for the front panel AM key:
0
- Output Turnoff
1
- Auto/Manual Control selection
2
- Heater Current display
5.3.8.4 SCAN TABLE {P} = ]
The Scan Table operation takes the form of a Type 2 interrogation command
which accesses a set of information (held in the {DATA} element in the response).
The response would be in the form:
L {N} ] xx aaaaa bbbbb ccccc ddddd eeeee A *
where xx is the number of data digits in the {DATA} element to follow; this is 20 for
a single-control-output instrument and 25 for a dual-control-output instrument.
These digits are as described in Table 5-2 and may comprise:
aaaaa
The current setpoint value
bbbbb
The current process variable value
ccccc
The current value of Output 1 Power (0 - 100%)
ddddd
The current value of Output 2 Power (0 - 100%), if
applicable.
eeeee
The Controller Status (see Note 2 on Table 5-2).
5.4
ERROR RESPONSE
The circumstances under which a received message is ignored are:
Parity error detected
Syntax error detected
Timeout elapsed
Receipt of a Type 4 message without a preceding Type 3 message.
Negative acknowledgements will be returned if, in spite of the received message
being notionally correct, the Controller cannot supply the requested information
or perform the requested operation. The {DATA} element of a negative
acknowledgement will be indeterminate.
O075-5
5-15
PM-0075