User manual

19 Chapter 2
Figure 2.11: Mode Selections for PCL-741
Should you want to configure the PCL-740 or PCL-741 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. 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.
Figure 2.12: Active and Passive Setting for Current Loop
Note: When RS-232, RS-422 or RS-485 mode is
selected, current-loop Tx/Rx active/passive
jumpers are inoperable.
Note: Whatever mode you select, you must ensure that
this is not the same mode as the device that
PCL-740 or PCL-741 is connected to. The dia-
gram below shows a typical configuration.