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First you have to decide which mode each port will be operating in,
RS-232, RS-422, RS-485 or current-loop driver mode. Select the
correct jumper configuration on jumper JP5.
RS-232
RS-422
RS-485
Current-Loop
Note: When either RS-232, RS-422 or RS-485 mode is selected, the
two current-loop Tx/Rx active/passive jumpers are inoperable.
Should you want to configure the PCL-740 to operate in the current-
loop mode, configure the main jumper for current-loop. You also
have to set Tx and Rx for active or passive mode. In the active mode
the Tx or Rx will generate the current required for data transfer over
the link. In the passive mode the current is generated by the card at
the other end of the link.
TxD
RxD
You may configure both the Tx and Rx to operate in the same mode,
or you can configure each Tx and Rx to operate in different modes.
Note: Whatever mode you select you must ensure that this is not the
same mode as the device that your PCL-740 is connected to. The
diagram on the next page shows a typical configuration.
12
PCL-740 User's Manual
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