22
2 CM-CU21 Rear Panel Controls & Connections
GPIO Port
The Commentator Unit’s GPIO port has 7 open-collector driven outputs and
4 active low inputs. The 7 open-collector outputs, which are low (conducting)
when active, indicate which of the On Air or Talkback channels are active.
The 4 active low inputs can be configured to provide 2 different functions. In
the default mode, these inputs drive a call/alert signal on the corresponding
Talkback button. When an input is active, the associated Talkback button will
flash amber. In the second mode, these inputs control the talkback function
and the effect is similar to pressing the corresponding talkback button.
The GPIO port connector is a 15-way female D-type with the following pin
assignments:
Pin Number I/O Function
1
O Commentator 1 ON AIR active – open collector output
2
O Commentator 1 TALKBACK A active – open collector
output
3
O Commentator 1 TALKBACK B active – open collector
output
4
O Commentator 2 ON AIR active – open collector output
5
O Commentator 2 TALKBACK A active – open collector
output
6
O Commentator 2 TALKBACK B active – open collector
output
7
O Commentator 3 ON AIR active – open collector output
8
- No connection
9
- Digital ground (0V)
10
I Commentator 1 TALKBACK A call/alert or activate –
active low input
11
I Commentator 1 TALKBACK B call/alert or activate –
active low input
12
- Digital ground (0V)
13
I Commentator 2 TALKBACK A call/alert or activate –
active low input
14
I Commentator 2 TALKBACK B call/alert or activate –
active low input
15
- Digital ground (0V)
Mains Power
Mains power is applied via a standard three-pin IEC male socket. Mains
voltages between 85V and 264V AC at frequencies between 47 and 63Hz
are accepted without adjustment.
A 1A, 5 x 20mm SB fuse is used. The Earth pin MUST be connected to
ensure safety.
