8
1 CM-CU1 Rear Panel Controls & Connections
GPIO Port
The CM-CU1’s GPIO port has 5 open-collector driven outputs and 4 active
low inputs. The open-collector outputs, which are low (conducting) when
active, indicate which of the On Air or Talkback channels are active.
Each of the 4 active low inputs drives a call/alert signal on the
corresponding Talkback button. When an input is active, the associated
TALKBACK button flash amber.
The GPIO port connector is a 15-way female D-type with the following pin
assignments:
Pin Number I/O Function
1
O Commentator ON AIR active – open collector output
2
O TALKBACK A active – open collector output
3
O TALKBACK B active – open collector output
4
O TALKBACK C active – open collector output
5
O TALKBACK D active – open collector output
6
-
Digital ground (0V)
7
-
Digital ground (0V)
8
- No connection
9
-
Digital ground (0V)
10
I
TALKBACK A call/alert – active low input
11
I
TALKBACK B call/alert – active low input
12
-
Digital ground (0V)
13
I
TALKBACK C call/alert – active low input
14
I
TALKBACK D call/alert – 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.
