Epson MFJ-1278B manual Computer with Specific Serial Interfaces, Apple Macintosh, Hsko Hski, Gnd

MFJ-1278B MULTI-MODE COMPUTER INTERFACING

Many computers require a serial port adapter card. These cards incorporate the circuitry necessary to add an RS-232C port to the computer. Some popular models in this category are the Apple II series, the IBM Personal Computer, many Radio Shack computers, and the Sanyo MBC-55X series. If you have one of these computers with an "add-in" serial port, or if you have another computer we haven't mentioned, you should skip to one of the sections on "other computers." If your computer has a 25-pin RS-232C serial port, refer to the section on Other Computers with 25-pinRS-232C Ports. Otherwise refer to the section Other Computers with Nonstandard Serial Ports.

Some computers have no serial port and no adapter is commercially available. Such computers are not suitable for use with the MFJ-1278B.

COMPUTER WITH SPECIFIC SERIAL INTERFACES

Apple Macintosh

The Macintosh serial port is an RS-422 compatible port, but it will work fine with the RS- 232C serial port on your MFJ-1278B.

MFJ Enterprises, Inc. offers an optional Starter Pack for the Macintosh. The Macintosh Starter Pack is available from MFJ Enterprises, Inc. or any dealer of MFJ products. The Starter Pack includes a cable for

connecting the MFJ-1278B to the Macintosh and a terminal program. The Starter Pack for Macintosh is MFJ-1287B. If you wish to use your own cable, you will need a cable wired as shown in Fig. 2-1.

Macintosh		MFJ-1278B	Macintosh	MFJ-1278B
8 Pin		DB-25P	DB-9P	DB-25P
1	(HSKO)	4	1	1
2	(HSKI)	6	5	2
3	(TXD-)	2	9	3
4	(GND)	7	3	7
5	(RXD-)	3	7	8
6	(TXD+)	N/C	6	4
7	(GPi)	N/C

Fig. 2-1. Serial port wiring for Apple Macintosh.

Note that pin 1 of the DP-9P connector is not connected inside the Macintosh or the MFJ- 1278B. We highly recommend the use of shielded cable, when making interconnections