INFICON T-Guard Leak Detection Sensor Interface description - Manual (Page 19)

RS232 ASCII Interface Protocol
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2.4.1.2 Measurement Cycle
Every command must be terminated by the two bytes
Carriage Return (CR, ASCII 13, \r) and Line Feed (LF, ASCII 10, \n), in this order.
The response you receive from T-Guard will also be terminated like this.
Command sent to
T-Guard
Response received
from HLD5000
Content
*STAT? MEAS status of the unit
*STAT:MEAS? READY last measurement finished
*CONF:MODE
ACCUMULATE OK switch to accumulation mode
*CONF:TRIG2ON OFF OK turn off trigger 2
*CONF:TIME:AUT ON OK turn on automatic times
*CONF:UNIT:VU LITER OK set volume unit to liters
*CONF:AV 10 OK set free volume to 10
*CONF:TRIG1:MBAR*L/S
5E-4 OK set trigger 1 to 5E-4 mbar*l/s
*START OK start measurement
*STAT:MEAS? GROSS1ACC first gross measurement
*STAT:MEAS? FINE1 first fine measurement
*STAT:MEAS? WAITACC accumulating
*READ? 1.0 leak rate not valid
*STAT:MEAS? GROSS2ACC second gross measurement
*STAT:MEAS? FINE2 second fine measurement
*STAT:MEAS? READY measurement finished
*STAT:ERR? NO ERROR/WARNING no errors
*READ? 2.30E-4 leak rate