Command Messages
Chapter Nine: RS-232 Communications
276
Read Only Messages
The read only messages prompt the 146 unit to return information. You cannot change the value
or setting of any read only parameter. The read only messages are divided into read only data
messages and read only status messages.
Read Only Data Messages
Message Description
Message Format
@ command
category
command
number
Parameter
Data
Optional
checksum
Channel Pressure
@
6
0
1
channel # 1, 2,
3, 4, 5 (dual 1),
or 6 (dual 2)
?
CR c1
c2
Channel Pressure with
Time Stamp
@
6
0
2
channel # 1, 2,
3, 4, 5 (dual 1),
or 6 (dual 2)
?
CR c1
c2
Channel Voltage
@
6
0
3
channel # 1, 2,
3, 4, 5 (dual 1),
or 6 (dual 2)
?
CR c1
c2
Ion Current
@
6
0
4
channel # 1, 2,
3, 4, 5 (dual 1),
or 6 (dual 2)
?
CR c1
c2
Emission Current
@
6
0
5
channel # 1, 2,
3, 4, 5 (dual 1),
or 6 (dual 2)
?
CR c1
c2
Pressure Leak Rate
@
6
0
6
channel # 1, 2,
3, 4, 5 (dual 1),
or 6 (dual 2)
?
CR c1
c2
Analog Set Point
@
6
0
7
Any character
?
CR c1
c2
Channel Condition
This is the best
message to use when
checking the pressure
reading
@
6
0
8
channel # 1, 2,
3, 4, 5 (dual 1),
or 6 (dual 2)
?
CR c1
c2
Power Up Status
@
6
0
9
Any character
?
CR c1
c2
Table 78: Read Only Data Messages
(Continued on next page)
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