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of
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The checksum value is a two-character value used to conduct checksums with external devices
when DIP Switch S3-5 is ON. The comma mark (
,
) must be included in the query string if sending
a checksum value. Although a checksum value is not necessary in a query string, the
Terranova® 752A will always output a checksum value regardless of DIP Switch S3-5 position.
The checksum function may be disabled by either setting DIP Switch S3-5 to OFF or sending a
00
checksum value when DIP Switch S3-5 is ON
–
see
Figure 3
for DIP Switch S3 location.
Character
Query
Output Format
CHANNEL 1 CHANNEL 2
MOD
Model Number
752A
VER
Firmware Version
X.XX
CU1
CU2
Current Reading
X.XX e-X [A]
PR1
PR2
Pressure Reading
X.X e-X
[Selected pressure unit]
VO1
VO2
High Voltage Reading
XXXX [V]
ST1
ST2
Terranova® 752A Status
00: OFF
01: Running
02: Cooling X
(X = Cool-down Cycle)
03: Shutdown
04: Interlock
(i.e. Open Safety Interlock)
UN1
UN2
PRESSURE UNIT Value
TORR, MBAR, PASCAL
PS1
PS2
PUMP SIZE Value
XXX.X [L/s]
(0.1 - 999)
PO1
PO2
High Voltage Polarity
NEG
(Regardless of polarity)
HV1
HV2
High Voltage State
ON, OFF
MC1
MC2
MAX CURRENT Value
X.XX e-X [A]
SP1
SP2
SET POINT Value
X.X e-X
[Selected pressure unit]
MV1
MV2
MAX VOLTAGE Value
XX00 [V]
Table 10
. Serial communication query characters
Examples
Serial communication: RS-232/422
Checksum value: Disabled
CHANNEL 1 HIGH VOLTAGE display reading: 4.30 kV
*VO1?<cr>
Output:
OK:4300,NN
Serial communication: RS-485
Hexadecimal address: 05
Checksum value: 00
CHANNEL 2 HIGH VOLTAGE display reading: 4.30 kV
*05VO2?,00<cr>
Output:
05,OK:4300,NN
NN is the two-character checksum value that is automatically
calculated and output by the control unit
