STX Signal Transmitter Installation and Operation ... - Kistler-Morse

Appendix B. Serial Commands
Note
The remaining commands deal with performing an Auto Calibration. Refer to the Auto section
in Chapter 7, MVS-STX Calibration Menu, for a description of the calibration functions
and methods.
‘L’ Command — Auto Lo Span Calibration
This command is sent by the master to request the STX to set Lo Span for the channel. For this
example, the master sets the Lo Span to 25,000 lbs for an STX at address 01. The STX returns a
status code of 0 (calibration successful) and a checksum of 30.
Request from Master
Response from STX
>aaLdddddddssr Adssr Format
>01L002500004r A030r Example
Note: In response from STX:
d = 0 = calibration successful
d = 1 = “Ambiguous” warning. Hi span counts are greater than lo span counts.
d = 2 = “Move more material” warning. Change in weight caused a change of less than
20,000 counts.
‘H’ Command — Auto Hi Span Calibration
This command is sent by the master to request the STX to set Hi Span for the channel. For this
example, the master sets the Hi Span to 50,000 lbs for an STX at address 01. The STX returns a
status code of 0 (calibration successful) and a checksum of 30.
Request from Master
Response from STX
>aaHdddddddssr Adssr Format
>01H0050000FEr A030r Example
Note: In response from STX:
d = 0 = calibration successful
d = 1 = “Ambiguous” warning. Hi Span counts are greater than Lo Span counts.
d = 2 = “Move more material” warning. Change in weight caused a change of less than
20,000 counts.
‘Z’ Command — Auto Zero Calibration
This command is sent by the master to request the STX to set Zero for the channel. For this
example, the master sets the Zero Calibration point to 0 lbs for an STX at address 01. The STX
returns a status code of 0 (calibration successful) and a checksum of 30.
Request from Master
Response from STX
>aaZdddddddssr Adssr Format
>01Z00000000Br A030r Example
Note: In response from STX: d = 0 = calibration successful
B-6