Instruction manual
ACU-1000 Operations Manual
2-14 Interoperability Now
2.9.1 DC Input Connector
This two-pin terminal block is mounted on the rear panel. The terminals for the ground (GND)
and positive DC input voltage (+V) are clearly marked.
2.9.2 HSP-2A Module Connections
The HSP-2A module must be plugged into the first slot to the right of the PSM module; this is
extension 00 in the card cage, and connects it to P13 on the backplane. The HSP-2A has
improvements over the HSP-2 module that it replaced. On that affected P13 was an improved
interface with devices that had a COR output. To maintain backwards compatibility, a jumper
was added (J10) to allow the HSP-2A to function like the HSP-2. For this reason, some of the
pin signal names and description vary based on the location of the J10 jumper (as described
within the table).
Table 2-4 HSP-2A Module Connections- P13
PIN Signal Description
1
Ground
Ground connection.
2
N/C
No connection.
3
/AUX Out 1
Auxiliary Output 1- Active low; used for special functions only.
4
/AUX In 1
Auxiliary Input 1- Active low; used for special functions only.
5
Ground
Ground connection.
6
External Speaker
– or –
Ground for single ended
TX audio- TX Out B
External Speaker output- Use JP1 to enable.
Configure via JP10; pins 1-2 for Ext Spkr, pins 2-3 for TX audio
ground. Ground used to allow use of standard Raytheon radio and
NXU-2A interface cables.
7
Audio Ground
Ground connection for audio input.
8
RXA
Audio Line In
0 dBm line level audio input; 22k-100K ohm impedance via gain
select jumpers JP7-JP9. (RXA)
9
N/C
No connection.
10
/AUX Out 2
Auxiliary Output 2- Active low; used for special functions only.
11
/AUX In 2
Auxiliary Input 2- Active low; used for special functions only.
12
/PTT Out
Active Low PTT output to a transmitter.
13
COR IN (/AUX In 3)
COR Input from a receiver; active low. May also be configured as
Auxiliary Input 3- Active low; used for special functions only.
14
TX Out A
(unbalanced)
Same audio as fed to the speaker except at 0 dBm line level from a
600 ohm source. Level is not affected by the front panel volume
control.
15
Ground for single-ended
RX Audio - RXB
Ground connection for Line In (RXB)