DESCRIPTION
The MASTR IIe Utility Handset 19A705965P1 or
19A705870P2 and handset cable 19D901619P2 are used with
the Auxiliary Backplane (B3MB1B) to provide simple, port-
able programming and diagnostic functions for the MASTR
IIe Control Shelf. Information contained in this section is
applicable to MASTR IIe stations using Group 5 or earlier
software.
The Control Shelf auxiliary backplane contains the handset
interface circuitry and the handset connector. This backplane
allows the service technician to perform some programming
and diagnostic functions using the MASTR IIe Utility Hand-
set. The Handset provides the following:
•
Local Microphone & Speaker
•
Adjustment of Digital Potentiometers
•
Station Metering
•
Channel Selection
•
Function Enable/Disable
CONTROL SHELF
The Control Shelf hardware includes a EEPROM contain-
ing the operating characteristics (or personality) of the Control
Shelf. The contents of the EEPROM can be changed only with
the use of the Utility Handset (and cable) connected to the
Auxiliary Backplane board, or with a personal computer.
All audio input and output levels for the Control Shelf are
controlled by electronic potentiometers. These potentiometers
must be also be adjusted by the Utility Handset and cable, or
by a personal computer. There are NO manual adjustments on
the Control Shelf!
A complete description of the Control Shelf EEPROM
personality settings is contained in the programming software,
TQ3353. A complete listing of all lines and signals as well as
a Level Adjustments Discussion is contained in the Control
Shelf Maintenance Manual, LBI 38430.
AUXILIARY BACKPLANE
The Auxiliary Backplane plugs into the standard MASTR
IIe Backplane through a 96-pin DIN connector (see Figure 1).
The backplane contains the necessary hardware to convert
TTL levels of the handset to RS232 data understood by the
MASTR IIe Control Module.
A mounting bracket and TORX
®
T15 screws secure the
Auxiliary Backplane to the station frame. The Utility Handset
cable connects to the RJ45 jack (J2) on the Auxiliary Back-
plane board.
OPERATION
POWER ON
While depressing either VOLUME button on the side of
the handset, toggle the RESET switch on the front of the
MASTR IIe Power Module. This tells the Control Module
there is a handset present.
Figure 1 - Backplane and Auxiliary Backplane Boards
LBI-38599
A-3
