INFICON T-Guard Leak Detection Sensor Interface description - Manual (Page 21)

RS232 ASCII Interface Protocol
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2.4.2.2 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 CARGAS OK switch to carrier gas mode
*CONF:TRIG2ON OFF OK turn off trigger 2
*CONF:TIME:AUT ON OK turn on automatic times
*CONF:UNIT:FU SCCM OK set flow unit to sccm
*CONF:CF 30000 OK set carrier gas flow to 30000
*CONF:TRIG1:MBAR*L/S
1E-3 OK set trigger 1 to 1E-3 mbar*l/s
*CONF:TIME:MEAS? 5.0 read measurement time
*START OK start measurement
*STAT:MEAS? READY measurement finished
*STAT:ERR? NO ERROR/WARNING no errors
*READ? 2.30E-4 leak rate