User manual

program mode in that it conforms to special kinds of SELCALs.
These callsigns are allocated to vessels by international law
according to CCIR recommendations and may be composed of 4
letters, 4 digits, 5 digits, or 9 digits. The software automatically
changes to either CCIR 476 or CCIR 625 modes to accommodate
these different SELCALs. It also automatically detects and sets the
correct mode when and ARQ call is established.
Slightly different configuration is needed depending on whether
the SG-7200 is used aboard a vessel at sea, or used as part of a
shore station. This involves the use of free-signal broadcasting and
CW identification when used with shore-based operations.
Like for AMTOR mode, valid SELCALs and answer-back strings
is required prior to initiating any ARQ calls. The keyboard mode
also is used for this mode to enter data for transmission and to
print received traffic.
8.0 Updating Software
Experienced software developers may install their own software on
ROMDISK. It is recommended that the SG-7200 Technical Reference Manual
be consulted during such developments.
8.1 Updating ROMDISK
Note all existing files in the Flash will be erased before the update
begins.
A more permanent installation requires ROMDISK update. This
requires that a full ROMDISK image be developed from the above
process and be available for use in the steps outlined below.
Note: This ROMDISK image file must be on a hard disk not a floppy
disk available for down load in the following steps.
•It is assumed that a communications program is set for 9600, 8, N, 1
and is connected to Host Computer connector on the SG-7200. The
communications program must be capable of transferring binary data
using the XMODEM protocol such as ProComm or Telix.
•Power to the modem should be turned off. Enable the Flash update
utility by setting JP5 (close to the front of the modem) to the “FORCE
UPDATE” position 2-3 and turning the power on to the modem. This
setting of JP5 will be detected by the bootstrap software and control
passed to the Flash programming utility. Note that this utility uses
DRAM as a memory cache to holds the new ROMDISK image and it is
thus very important that the SIMM has been installed correctly. Also
DRAM must be working and functioning perfectly before the Flash
update was initiated, i.e. if the system succeeded in booting to the DOS
prompt previously, that would be sufficient. As a precautionary step,
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