DIGITIZE DGM-32/64, Installation And Maintenance Manual

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DGM INSTALLATION AND MAINTENANCE MANUAL
12 700135-0000 Rev. O
2.6.2.2 CONNECTOR P4
This connector is used to connect the Power Supply Board to the Main Board.
2.7 RS-422/485 INTERFACE BOARD P/N 400405-0003 (STD)
2.7.1 GENERAL
This circuit board assembly is used to interface the two-wire multiplex
communications line to the DGM. The RS-422/485 lines are supervised. The
SYSTEM 3505 PRISM LX loca
tion must have a “Style 3 or 6” RS-422/485 line driver
for proper interface with the standard RS-422/485 interface board.
2.7.2 WIRING
Field wiring for this board must be tested and connected prior to assembling the rest
of the unit. Observing polarity, connect the communications line(s) to the proper
terminals.
2.7.2.1 Terminals 1 and 2 (Channel A)
These terminals are used for multiplex communications in a system utilizi
ng “Style 3”
or “Style 6” wiring or as the primary channel of a system wired for “Style 6”
operation.
2.7.2.2 P1
This connector must be plugged into P1 of the main board of the DGM.
2.7.3 RATINGS
Maximum Circuit Voltage: 5 volts
Maximum Circuit Current: 50 mA.
Maximum Line Impedance: 70K
2.8 RS-232 INTERFACE BOARD P/N 400407-0003 (OPTIONAL)
2.8.1 GENERAL
This circuit board assembly is used to interface the three-wire multiplex
communications line to the DGM. The RS-232 lines are supervised. The SYSTEM
3505 PRISM LX location must have an RS-232 line driver for proper interface with
the optional RS-232 interface board at the DGM. This RS-232 board is used when
interfacing to a carrier system, such as “T1” network system. When interfacing to a
“T1” network, the DGM channel assigned may need to be the “Order Wire”. The
standard “T1” channel strips away the parity bit and substitutes its own parity bit.
The DIGITIZE Multiplex system uses the parity bit in a forced parity mode. This
conflicts with some “T1” network systems. Other uses for the RS-232 interface can
be for interfacing to customer owned modem communications systems.