SRS Labs SR510 - Manual (Page 23)

19
Q
The Q command returns the output reading in
units of volts. For an input signal of 50
µ
V on a full
scale sensitivity of 100
µ
V, the Q command will
return the string "50.00E-6". The parameter read
is the same as that being shown on the output
display and can be changed with the S command.
R {n}
If n is included, the R command sets the reference
input trigger mode. If n is absent, the trigger
mode is returned.
n Mode
0 Positive
1 Symmetric
2 Negative
S {n}
If n is included, the S command selects the
parameter shown on the analog meter and output
digital display as well as the output BNC. If n is
absent, the parameter being displayed is returned.
n Display
0 X
1 Offset
2 Noise
T m {,n}
The T command sets and reads the status of the
time constants. If m is "1", the pre time constant
is selected, if m is "2", the post time constant is
selected. The parameter m is required. If n is
included, the T command sets the selected time
constant. If n is absent, the setting of the selected
time constant is returned.
n Pre Time Constant (m=1)
1 1 mS
2 3 mS
3 10 mS
4 30 mS
5 100 mS
6 300 mS
7 1 S
8 3 S
9 10 S
10 30 S
11 100 S
n Post Time Constant (m=2)
0 none
1 0.1 S
2 1 S
U m {,n}
The U command sets and reads the unit's ROM
calibration bytes. m is the address offset of the
byte, 0-255. If n is absent, the value of the
addressed calibration byte is returned. If n is
included, the addressed calibration byte is set to
the value of n, 0-255. The new value will be in
effect until the power is turned off or a reset
command is issued. Use of this command is not
recommended.
V {n}
If n is included, the V command sets the GPIB
SRQ (service request) mask to the value n. If n is
absent, the value of the SRQ mask is returned.
W {n}
The W command sets and reads the RS232
character wait interval. If n is included, the SR510
will wait n*4 mS between characters sent over the
RS232 interface. This allows slow computer
interfaces to keep up. n can range from 0 to 255.
If n is absent, the wait value is returned. The wait
interval is set to 6 on power-up.
X n {,v}
n designates one of the 6 general purpose analog
ports located on the rear panel. If n is 1,2,3, or 4,
the X command will return the voltage on the
designated analog input port (X1-X4) in volts. If n
is 5 or 6, then v may also be sent. If v is included,
the designated analog output port (X5 or X6) will
be set to v volts where v has the range -10.24V to
+10.24V. If v is absent, the output value of the
selected port is returned. On power-up, port X5 is
the ratio output. An "X 5" command will read the
ratio output. An "X 5" command with the
parameter v will set port X5 to v volts, overriding
the ratio output. Port X5 will return to the ratio
output on power-up or reset.
Y {n}
The Y command reads the status byte. (See
below for a definition of the Status Byte.) n
designates one bit, 0-7, of the status byte. If n is
included, the designated bit of the status byte is
returned. The bit which is read is then reset. If n
is absent, the value of the entire byte is returned
and all status bits are then reset. This status byte
may also be read over the GPIB using the serial
poll command.
Z
The Z command causes an internal reset. All
settings return to their default values. The ERR