Appendix Arevision Summary; Introduction; Transceiver Operating Software; Updates - E.F. Johnson Company Summit DM 975x Service Manual

A.1 INTRODUCTION
This appendix describes the changes that have
been made to the Summit DM transceivers and
programming software through May 1998. The
component changes that have been made through
January 1995 are listed in Table A-2, and additional
component changes made through May 1998 are listed
in Table A-3.
A.2 TRANSCEIVER OPERATING SOFTWARE

UPDATES

There have been several updates to the trans-
ceiver operating software since the Summit DM trans-
ceivers began shipping. The version number of the
software is briefly displayed when power is turned on
(see Section 3.6.14).
The operating software can be updated in the
field by Write-On™ Flash Programming as described
in Section 4.7. The transceiver operating software
should not be confused with the programming soft-
ware described in the rest of Section 4. Table A-1 lists
the versions of transceiver operating software that
have been released and describes the main changes
that occurred with each.
A.3 REVISION LETTER CHANGES
A.3.1 TRANSCEIVER REVISION LETTER
The transceiver revision letter is part of the iden-
tification number described in Section 1.4. The
changes that occurred with each revision letter change
are as follows:
"B" (9755 only) - These models have an updated PA
board that eliminated the need to cut a pad to install the
optional DC line filter. This was never required on oth-
er models.
"B" (all except 9755), "C" (9755) - These models have
an updated PA board that eliminated the need to lift the
lead of U500, pin 1 before flash programming (see Sec-
tion 4.7).
APPENDIX A REVISION SUMMARY
A-1
"C" (all except 9755), "D" (9755) - These models have
Version 204 software that supports the horn alert fea-
ture for interconnect and Multi-Net unique ID calls (see
Table A-1).
"E" (all models) - These models have the Version 206
software described in Table A-1. In addition, they have
a small add-on board which provides static protection
diodes on certain accessory cable lines. (Revision letter
"D" was skipped on all but 9755 so that all models
would have the same revision letter.)
"F" (all models) - These models have an audio/logic
board that is upgraded with static protection diodes
CR500-CR515 to eliminate the need for the add-on
board implemented with "E" models.
"G" (all models) - These models have the Version 214
software described in Table A-1. In addition, diode
CR601 on the audio/logic board has been deleted.
"H" (all models) - These models have the Version 215
software described in Table A-1. No hardware changes
occurred.
A.3.2 CONTROL UNIT REVISION LETTER
The changes that occurred with each control unit
revision letter change are as follows:
"B" - These models include U102 (IIC buffer). "A"
models do not include this part because it was not avail-
able. Currently, this device is not used.
"C" - These models have upgraded software to make
them compatible with Summit transceivers which have
Version 206 or later operating software. Refer to Sec-
tion A-5 for more information.
A.4 PROGRAMMING SOFTWARE CHANGES
Version 202 Software
Version 202 of the programming software was
released in November 1994. This or a later version is
required to program transceivers with Version 206 or
REVISION SUMMARY
Revised December 2000
Part No. 001-9750-007