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Publication No. 980935 Rev. A
3152B User Manual
EADS North America Test and Services
Programming Reference 5-33
Response
The 3152B returns BIT, LCOM, SSYN, HCL, PULS, ZERO, INT, or EXT depending on the current 3152B
trigger source setting.
OUTPut:TTLTrg <n,OFF|ON|0|1>(?)
HS Syntax: 0230B<0|1|2|3|4|5|6|7,0|1>(?)
Description
The TTLTRG lines can be used to transmit and receive trigger signals between the 3152B and other VXIbus
modules. Use this command to transmit signals on the backplane trigger lines.
Parameters
Name
Range
Type
Default
Description
<n>
0-7,0-1
Integer
1
Designates a specific backplane trigger line as an
output and enables or disables it. Trigger line used is
specified using the outp:trig:sour command.
Response
The 3152B returns n,0 when a specific backplane trigger line is off or n,1 when a specific backplane trigger
line is enabled. The trigger line <n> can range from 0 to 7.
ROSCillator:SOURce {INTernal|EXTernal|CLK10}(?)
Description
This command selects the reference source for the sample clock generator.
HS Syntax:0028A <0|1>(?)
Parameters
Name
Type
Default
Description
INTernal
Discrete
INT
Selects the internal source, a 1ppm TCXO
EXTernal
Discrete
Enables the external reference input (available on
3151B and 3100 models only). An external reference
must be connected to REF IN for normal operation.
CLK10
Discrete
Selects the VXI CLK10 reference. The CLK10 is routed
in parallel to all backplane connectors allowing all of the
modules installed in the VXI mainframe to use the same
clock source which can be useful for synchronization
purposes.
Response
The 3152B returns INT, EXT, or CLK10 depending on the current 3152B reference clock source setting.
FREQuency:EXTernal?
HS Syntax: 0420@?
Description
This command queries the frequency at the trigger input. The same trigger is also used for phase locking to an
external signal. This command returns the frequency value of the external signal only when the instrument is in
PLL mode and locked.
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