Grass Valley XtenDD DD - Manual (Page 162)

7. Initial Installation
7 - 32 Planning and Installation - Rev. 3 / 04.2005
Genlock Relevant Control LEDS
at Front Side of Board:
Meaning
G6 SER_SD_REF_DETECT
G7 SER_HD_REF_DETECT
G8 SYNC_ERROR
G21 Analog input detect
“on” if serial digital reference
SDTV is detected, green
“on”, if serial digital reference
HDTV is detected, green
“on” , if selected sync input,
digital or analog, is unlocked
or not present
not used / for internal test only!
7.4.10.2 GPI Configuration
The sliding switches T12 ... T19 on the controller board RY 3490 are assigned to
the GPI inputs 1...8 (general-purpose inputs). These inputs are provided with opto-
couplers. 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 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.