Kurt J. Lesker 979 Series, Operation And Maintenance Manual

Page: 26 / 54

26 Series 979 ATV Transducer
Baud Rate – BR
The BR command returns or sets the baud rate of the communications
protocol. The 979 responds to this command at the present baud rate;
however, the user will need to change the baud rate on the host to ensure
future commands are sent at the same rate.
Values: 2400, 4800, 9600, 19200 (default: 9600)
Query: @001BR?;FF
Query Response: @001ACK9600;FF
Command: @001BR!19200;FF
Command Response: @001ACK19200;FF
Analog Output - DAC
The DAC command returns or sets the analog output scale: 1 is 0.5V/decade
of pressure; 2 is 0.774V to 10V.
Values: 1, 2
Query: @001DAC?;FF
Query Response: @001ACKDAC1;FF
Command: @001DAC!2;FF
Command Response: @001ACKDAC2;FF
Emission Current – EC
The EC command returns or sets the sensor’s emission current to 100uA or
Auto range (100uA above 1x10
-4
and 1mA below 1x10
-4
Torr).
Values: 100UA and AUTO for commands;
100UA, 1MA AUTO, and 100UA AUTO for responses
(default: AUTO).
Query: @001EC?;FF
Query Response: @001ACK1MA AUTO;FF
Command: @001EC!AUTO;FF
Command Response: @001ACK100UA AUTO;FF
Factory Default – FD
The FD command sets all 979 parameter values to the factory default
settings shown in the
979 ATV Transducer Factory Defaults Table (page 22).
NOTE: The FD command overrides all parameter values the user sets; use
with caution! The address and baud rate reset to 253 and 9600, respectively.
The user must change the address and baud rate to these values on the host
to communicate with the transducer after using the FD command.
Command: @001FD!;FF
Command Response: @001ACKFD;FF