Grass Valley XtenDD DD - Manual (Page 168)

7. Initial Installation
7 - 38 Planning and Installation - Rev. 3 / 04.2005
GPI Configuration The sliding switches T2 ... T7 on the controller board RY 2100 (T8 ... T13 on control-
ler board RY 2370) are assigned to the GPI inputs 6 ... 1 (general-purpose inputs).
These inputs are provided with optocouplers. The switches enable to match the in-
puts to different control concepts:
Switch in position”1” (position ”left”)
A simple connection between the two connectors activates the corresponding in-
put. 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.
Since the circuit ground is led out of the device, the cabling has to be shielded for
this kind of control. 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 pro-
vided; the controlling device, however, has to impress a current upon the LED, i.e.
a simple contact is not suited in this case.
Due to the ground potential isolation, the cabling is less critical for this kind of con-
trol.