GAI-Tronics 12580-001 Audio Distribution Module - Manual (Page 7)

Pub. 42004-600L2C
Model 12580-001 Amplifier Distribution/Monitor Module Page: 7 of 17
f:\standard ioms - current release\42004 instr. manuals\42004-600l2c.doc
10/11
Data Communication Line
Terminal block, TB21 is provided to enable the RS-485 signal to be daisy-chained to additional
Snaptrack™ modules. The pinout for the data communications line is shown in Table 4.
Table 4. Data Communications Line - TB21 Pinout
Pin
No. Function Description
1
485 +
Daisy-chains the positive leg of the RS-485 interface to other Snaptrack
™ modules
(I/O)
2
485 −
Daisy-chains the negative leg of the RS-485 interface to other Snaptrack
™ modules
(I/O)
N OTE : The conductors terminated on this terminal block should be a twisted pair.
Central Amplifier Audio Distribution
Terminal blocks TB2, TB5, TB8, TB11, TB14, and TB17are provided to connect audio from the AZI to
the six central amplifier inputs. The audio signals are differential, so a 2-connductor cable is required for
each input. An additional termination point (EGND) has been provided for an earth ground connection.
The pinout for TB2, TB5, TB8, TB11, TB14, and TB17 is shown in Table 5.
Table 5. Central Amplifier Audio Distribution - TB2, TB5, TB8, TB11, TB14, and TB17 Pinout
Pin
No. Function Description
1 AMP L1 Connects one leg of audio to a central amplifier’s input (output)
2 AMP L2 Connects the other leg of audio to a central amplifier’s input (output)
3 AMP EGND Connects earth ground to a central amplifier (output)
N OTE : For optimum audio quality, the conductors terminated on pins 1 and 2 of these terminal blocks
should be twisted pairs.