Codan NGT 2010 RF Technical & Service Manual page 789

8571—Technical description
Multi-line capability
The information in this section should be read in conjunction with the following
diagrams:
8571 Remote Control (NGT)
Interface Assembly
Backplane
Option 2W
Option 4W
A second input/output line (2W or 4W), may be provided by fitting an additional line
unit to the 8571.
The additions required for a second line are as follows:
•
•
An additional third and fourth line (2W or 4W) require a second Dual Line Equaliser
PCB.
The additions required for a third and fourth line are as follows:
•
•
•
The Dual Line Equaliser PCB providing input/output lines 3 and 4 is identical to the
PCB already fitted for input/output lines 1 and 2.
To enable the microprocessor to individually control either PCB, the ADC and
input/output expander on each PCB is provided with a separate address (0, 1, 1, 0 for
lines 1 and 2, and 0, 0, 1, 0 for lines 3 and 4). The address is set for each assembly when
they are fitted to the appropriate connector on the Backplane PCB and is applied to P1
pins 10a, 10b, 11a and 11b. Once the addresses have been set for the PCBs, they remain
the same even if the card positions are reversed.
350
2-wire line isolating assembly 08-03817, or
4-wire line isolating assembly
Dual Line Equaliser PCB 08-03905, and
2-wire line isolating assembly 08-03817, or
4-wire line isolating assembly
08-05994 (sheet 1)
08-05995
15-10509-001
15-10510-001
08-03995
08-03995
NGT Transceiver System Technical Service Manual