Atec Varian-6900K Series User Manual
Page 3
Language,
cont.
Special 488
Functions
Reset Statement
RST [SGC :CHØ] CR [LF]
Upon receipt of this command, the High Voltage is switched OFF. If it is ON the
heater is switched OFF and any faults reset.
Status Statement
STA [SGC] CR [LF]
Upon receipt of this command, the TMA prepares a current status response. This
command must be issued before addressing the TMA as a Talker.
Status Messages when addressed as a Talker:
Command Accepted:
[Space] CR LF
Fault:
FØ7TWTA:[fault message] CR LF
Priority
Fault Messages
1
SYNTAX ERROR
2
THRM OVERLOAD
3
HELX OVERCURRENT
4
INTERLOCK FAULT
5
DUTY CYCLE TRIP
6
PRF TRIP
7
GRID FAULT
8
SUMMARY FAULT
Heater Time Delay:
FØ6TWTA:AMP TIMING CR LF
Same as 6900K4 Series.
Device Clear/Selected
Causes all relays to de-energize and then assume initial pattern. Additionally, Device
Device Clear:
Clear and Selected Device Clear output a clear pulse on the Clear lines, initialize the
program flags and pointers and clear memory.
IFC:
IFC clears all Bus Interface functions and, if CLEAR switch on rear panel is on, will
cause all relays to de-energize and then assume PROM programmed initial pattern
and generate a clear pulse on the Clear lines.
SRQ (CSL mode only):
Generates a Service Request
Interrupt (SRQ) when external data is received if not addressed as a talker. SRQs
can be completely inhibited by depressing the front panel SRQ INHIBIT switch.
The SRQ signal is reset when the TWTA is addressed to talk or when Serial Polled.
Serial Poll Response:
The TMA responds to a serial poll by placing an 8-bit character on the Bus data
lines. The bit assignments are:
DI0 1
Heater Time Delay
DI0 2
Standby
DI0 3
HV ON
DI0 4
Zero
DI0 5
Command not executed, syntax error causes RSV bit (DI0 7) to be set.
DI0 6
Summary Fault
DI0 7
RSV
DI0 8
Zero
Parallel Poll Response:
The TMA responds to a parallel poll by placing the Ready Status condition in the bit
selected by the PPE command. The bit is a logic ‘1’ if the RDY light is on, logic ‘0’
if off. The Ready Status is determined by the Summary Fault condition; i.e. Not
Summary Fault = Ready.
Mechanical &
Environmental