Bristol 871A - Stored Data Buffer

Model 871A User’s Manual MAKING MEASUREMENTS
Bristol Instruments, Inc. 36
Connection Port
The RS-422 on the rear panel of the 871 system provides digital signals for collecting the
data steam described above. The RS-422 uses a 6-pin, female, RJ11 style connector
shown in Figure 5.3 and with a pinout described in the table below.
Figure 5.3: Raw Data Port
Pin
Signal Name
Signal
Type
Description
1
NC
No Connection
2
GROUND
-
Circuit ground.
3
Rx+
INPUT
Receive +
4
Rx-
INPUT
Receive -
5
Tx+
OUTPUT
Transmit +
6
Tx-
OUTPUT
Transmit -
Stored Data Buffer
The 871 system allows the user to buffer up to 1 million measurements in the instrument’s
internal storage. This section describes the semantics and formatting of the measurement
data stored in the buffer along with the process for retrieving the stored data. Control of
the buffering is done using the NuView software or through the use of the MMEMory
Subsystem of SCPI commands.