Manual

8
CM-CU1 Commentator Unit User Handbook
REAR PANEL CONTROLS & CONNECTIONS
REAR PANEL CONTROLS & CONNECTIONS
4
Pin 1: 0V
Pin 2: No connection
Pin 3: No connection
Pin 4: +VE (12-24 Volt DC)
When powering the CM-CU1 via the DC supply input, it is important to ensure that the unit
is suitably earthed. An earth connection point is provided on the rear panel in the form of a
M4 stud and screw and this should be connected directly to a technical earth.
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.