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Chapter 4 Command Reference
:SYSTem Subsystem
4-114 Programming Guide
:SYSTem Subsystem
This subsystem collects together the capabilities that are not related to instrument
performance.
:SYSTem:COMMunicate Subtree
The :SYSTem:COMMunicate subtree collects together the configuration of the
control/communication interfaces.
The :SYSTem:COMMunicate:SERial subtree controls the physical configuration
of the RS-232C port. Any command to change the settings takes effect
immediately upon receipt of the “program message termination.” These settings
are stored in non-volatile memory, and are unaffected by power-on, save/recall,
and *RST.
The :SYSTem:COMMunicate:SERial:TRANsmit subtree controls parameters
associated with transmission.
The Counter will always use one start bit and one stop bit.
:SYSTem:COMMunicate:SERial:CONTrol:DTR IBFull | ON | LIMit
Sets or queries the hardware pacing scheme.
The ON parameter (which is equivalent to DTR: HIGH in the
front-panel Utility menu) indicates that the DTR (Data Terminal Ready) line,
which is pin 4 of the RS-232 connector , is always asserted
(HIGH) to always be ready to allow data to be sent to the printer. Choose the ON
parameter when the printer or cable you are using does not support handshaking.
The IBFull parameter (which is equivalent to DTR: HW PACE in the front-panel
Utility menu) sets the RS-232 DTR line to indicate when the device is ready to
receive. When the number of received bytes in the input buffer of the Counter
reaches a stop thresholdrhhhe the Counter will de-assert the DTR line. When the
number of bytes has been reduced to a start threshold, the Counter will assert
DTR, indicating that it can receive input again. The Counter will also monitor the
state of the DSR (Data Set Ready) line, which is pin 6 of the RS-232 connector,
and will stop transmission if either of those lines becomes de-asserted. Choose the
IBFull parameter when the printer and cable you are using require handshaking for
counter-to-printer communication.
The LIMit parameter (which is equivalent to DTR: LIMIT in the front-panel
Utility menu) indicates that the RS-232 DTR line will be used to indicate out of
limit. The LIMit parameter will force the DTR line HIGH if the measurement is in
limit, and LOW if the measurement is out of limit.