Models 947, 948 and 960 Leak Detectors Operations and Service Manual
2-12
2.5 Operation using the Optional Rear Panel Interface
Once setup is complete and the 947/948/960 is warmed up, operation can be turned over
to the discrete I/O by asserting the PARALLEL ENABLE input (J120 pin 6). Operations can be
monitored using the front panel display, or via a PLC.
2.5.1 Parallel Enable
The PARALLEL ENABLE input turns control of the 947/948/960 over to the discrete I/O
for efficient operation. Once PARALLEL ENABLE is asserted, operations can be monitored
using the host serial port, but most parameter values cannot be changed. If a command is
issued that is not allowed once PARALLEL ENABLE is asserted, the system response is
cant
.
See Section C, “Communications Protocol” on page C-1.
Operations can be monitored on the front panel display, but the parameter values cannot be
changed using the front panel. See Section D, “Inputs and Outputs” on page D-1.
To remove control from the discrete I/O, you must de-assert PARALLEL ENABLE
(J120 pin 6).
NOTE
Control remains with the discrete I/O, even if the leak detector
is shut down while PARALLEL ENABLE is asserted.
Summary of Contents for 948
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