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MFJ-1278B MULTI-MODE COMPUTER INTERFACING
Computer Interface with MFJ Starter Pack
If you are using one of the MFJ Starter Packs, you should use the cable provided to connect
the MFJ-1278B to your computer. Follow the instruction manual provided with the Starter
Pack to operate the terminal program and to connect the MFJ-1278B to your computer.
When finished with installation of the MFJ-1278B proceed to the "Computer Baud Rate", for
further information about TNC installation. The "Computer Baud Rate" section in this
chapter will continue to explain installation of the MFJ-1278B.
Computer Interface without MFJ Starter Pack
If you are not using an MFJ Starter Pack you should follow the instructions in this chapter for
computer interfacing.
SERIAL PORT SIGNALS
The serial port connector is on the rear panel your MFJ-1278B. There are several signals
available at this connector labeled "RS-232 SERIAL". You will not need all of these serial
port signals for normal operation. For some special applications, such as binary file transfers
or some Bulletin Board operations, you may want to use more of them. In that case, see
MFJ-1278B Serial Port Pin Functions in this chapter.
In Table 2-1 the user will see a list of the serial port pins that must be used, between the MFJ-
1278B and the computer. The pins listed are required by the MFJ-1278B for normal
operation. Note that the MFJ-1278B connects to a computer exactly as if the MFJ-1278B
were a standard RS-232C modem. If you have successfully used your computer with a
telephone modem, then hook it up to the MFJ-1278B in the same way. Use whatever
program you ordinarily use to communicate with the modem.
Pin Signal Name Description
2 Transmit Data Serial data from your computer to the MFJ-1278B.
3 Receive Data Serial data fromtheMFJ-1278B to your computer.
7 Signal Ground The common ground for both data lines.
Table 2-1. Serial port signals required by MFJ-1278B.
If your computer is listed in Table 2-2, refer to the specific information in the following
sections to connect your MFJ-1278B to your computer.
Manufacturer Model
Apple Macintosh (tm)
Apple II,II+,IIe,II-gs(tm)
Commodore VIC-20 (tm),C-64 (tm),C-128 (tm)
IBM
PCjr, PC
-
XT, PC
-
AT, 386/486, and most PC compatibles