Honeywell 620-0088 Parallel Link Driver Module (PLDM), installed in slot N of the Logic Manager Processor card file, controls I/O communications. It provides a D-type connector on the front cover plate of the module to enable I/O card files to be daisy-chained from the PLDM. The processor keyswitch is also located on the PLDM cover plate.
The PLDM contains two DIP switch modules that are set to perform the following
functions:
? Enable or disable Forcing, Data Change, On-line Programming and Scan Loss
functions.
? Clear or freeze outputs in the Program mode and during Scan Loss.
? Set Scan Loss time-out.

Two DIP switches, SW1 and SW2, are located on the top front edge of the PLDM printed
circuit board under the module side cover. They can be set without removing the side
cover. The Closed/On setting is achieved by pressing the switch toward the circuit board.

The 620-0088 Parallel Link Driver Module is required even when serial I/O is used exclusively, because the PLDM performs some system control functions in addition to supporting parallel I/O.
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