INTRODUCTION
The M AS TR III/M AS TR IIe Utility Handset
19A705965P1 or 19A705870P2 and handset cable
19D901619P2 are used to provide simple programming and
diagnostic functions to aid the service technician when servic-
ing the equipment.
This manual may be used with all versions of software. For
equipment using group 1 through 5 software, refer to Appendix
1 in the back of this manual. For MASTR III and MASTR IIe
with group 6 or later software, continue on in this section.
DESCRIPTION
In MASTR IIe applications the auxillary backplane
(B3MB1B) contains the handset interface circuitry and the
handset connector. The backplane allows the service techni-
cian to do some programming and to perform various diagnos-
tic functions using the Utility Handset. In MASTR III appli-
cations, all interface circuitry is housed in the Transmitter/Re-
ceiver shelf. The handset provides the following functions:
•
Local Microphone and Speaker
•
Adjustment of Digital Potentiometers
•
Station Metering
•
Channel Selection
•
Function Enable/Disable
CONTROL SHELF (MASTR IIe)
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 or with a personal computer.
All audio input and output levels for the Control Shelf are
controlled by electronic potentiometers. These potentiometers
must be adjusted by the Utility Handset 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 discussion of Level Adjustments is contained in Control
Shelf Maintenance Manual, LBI 38430.
AUXILIARY BACKPLANE (MASTR IIe)
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.
Figure 1 - Backplane and Auxiliary Backplane Boards
LBI-38599
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