User manual

Table Of Contents
Publication No. 980935 Rev. M 3152B User Manual
Astronics Test Systems Programming Reference 5-33
EXTernal
Discrete
This type selects the external trigger input as the trigger
source. An external signal must
be connected
to the
TRIG IN connector for this mode to operate correctly.
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 3152
B and other VXIbus
modules. Use this command to transmit signals on the backplane trigger lines.
Parameters
Name
Range
Type
Defaul
t
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 S
yntax:0028A <0|1>(?)
Parameters
Name
Type
Default
Description
INTernal
Discrete
Modern:
IN
T
Selects
the internal source, a 1ppm TCXO
EXTernal
Discrete
Enables
the external reference input
(available on
3151B and 3100 models only)
. An external referenc
e
must be
connected to REF IN for normal operation.
CLK10
Discrete
Legacy:
CLK10
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
purpose
s.
Response
The 3152B returns INT, EXT, or CLK10 depending on the current 3152B reference clock source setting.
FREQuency:EXTernal?
HS Syntax: 0420@?