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MFJ-1278B MULTI-MODE COMPUTER INTERFACING
time the MFJ-1278B signs on you will not need to press the return key to execute the
Autobaud routine. In setting AUTOBAUD to OFF, you should remember that if you change
the terminal program baud rate is changed, then MFJ-1278B will no longer be able to match
the new baud rate. You must change the baud rate of your terminal program to match the
baud rate you set for the MFJ-1278B or you may remove JMP 5 on the MFJ-1278B board to
reset the battery back-up RAM. Once reset, the MFJ-1278B will restore all parameters to the
default values, including the AUTOBAUD command. The default setting for the
AUTOBAUD command is ON. When the MFJ-1278B is powered on after resetting
memory, it will attempt to match the new baud rate and sign on after receiving the return key
presses sent by the user.
Changing Terminal Baud Rate
The MFJ-1278B RS-232 port will operate at the rate of 300*, 1200, 2400, 4800, 9600 or
19,200* baud.
The MFJ-1278B employs an AUTOBAUD routine that automatically matches it's terminal
baud rate to that of the rate set on the terminal program. The AUTOBAUD routine is
executed by pressing the "Return" key several times upon each power on cycle of the MFJ-
1278B. This means if the terminal program baud is set at 9600 baud, the MFJ-1278B will set
it's terminal speed to 9600 baud to match the program.
We suggest that once you select a terminal baud rate that you wish to operate your MFJ-
1278B on, you should set AUTOBAUD command to OFF. Once AUTOBAUD is turned
OFF, the MFJ-1278B will automatically sign-on without you having to press the "Return"
key. This is important if power a outage occurs, the MFJ-1278B will sign-on when power is
on again. If AUTOBAUD is OFF, and the terminal program baud rate does not match the
MFJ-1278B, then once the MFJ-1278B is turned off, it will not sign on again. If you reset
the MFJ-1278B or the terminal program baud rate, then the MFJ-1278B will sign-on. Once
reset, the MFJ-1278B will default AUTOBAUD to ON and it will sign on upon power up
and with a few strikes of the return key. The MFJ-1278B can be reset by removing JMP 5 on
the main PC board of the MFJ-1278B.
*The MFJ-1278B terminal baud rates of 300 and 19,200 is selectable by a jumper on JMP 18
on the mother board. Please refer to Chart XX on page ?? to locate JMP 18. For 300 baud
set the shorting jumper to positions 2-3 and for 19,200 baud set the shorting jumper to
positions 1-2. The factory setting for JMP18 is positions 1-2.