THOMSON grass valley XtenDD, Manual

Page: 115 / 250

5. Initial Installation
5 - 10 Planning and Installation - Rev. 0 / 04.2002
GPI Configuration The sliding switches T6, T8, T11, T13, T15, T18, T21 and T25 on the controller
board RY 3156 are assigned to the GPI inputs 1...8 (general-purpose inputs).
These inputs are provided with optocouplers. The switches enable to match the
inputs to different control concepts:
Switch in position”1” (position ”left”)
A simple connection between the two connectors activates the corresponding
input. This kind of control is suitable for a connection to a relay contact or to an
open-collector output.
Attention: When connecting to an open-collector output, there is no ground
potential isolation between the switcher electronics and controlling
devices.
Non-shielded cables may cause EMC and/or ESD problems!
Switch in position ”2” (position ”right”)
The optocoupler-internal LED is made available at the two connectors (including
1kOhm drop resistor). For this kind of control, a ground potential isolation is
provided; the controlling device, however, has to supply a current upon the LED,
i.e. a simple contact is not sortable in this case.
Due to the ground potential isolation, the cabling is less critical for this kind of
control.