PCMCIA card TSX SCP 112 20 mA current loop is used to connect April communication modules JBU0220 and JBU0250. The multidrop connection of PCMCIA card TSX SCP 112 to modules JBU0220 and JBU0250 is carried out in series mode. To connect April modules refer to reference manual TEM60000F.
NOTE: Important: You must configure card TSX SCP 112 in point to point mode in the Unity Pro configuration screen, for both the point to point or the multidrop series.
NOTE: The current loop authorizes a current of 20 mA when idle, in point to point as well as in multidrop mode.
If a slave is switched off the sender of this slave become active and the line is available.
If the loop supply is offset on one of the slaves, switching this slave off will cause communication to be interrupted.
Point to Point Link: Module JBU0220 or Active JBU0250
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Point to Point Link: Active TSX SCP 112 Card
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The following examples describe the different wiring possibilities for card TSX SCP 112 with modules JBU0220/0250.
NOTE: The 24 V supply of each TSX SCP 112 present on the loop must be connected, whether passively or actively, otherwise the link will not function.
These supplies must not have any shared (potential) point between them. Do not connect the -24 V supply to the earth.
Example 1: active master TSX SCP 112 multidrop
Example 2: active send/receive JBU0220/0250 multidrop
Example 3: multidrop master JBU0220/0250 active send/receive - slaves TSX SCP 112
Example 4: multidrop active master TSX SCP 112
