Epson manual MFJ-1278B Serial Port PIN Functions, Radio Shack Model 100/102 and NEC

MFJ-1278B MULTI-MODE COMPUTER INTERFACING

Radio Shack Color Computer

There are several terminal programs available for the Color Computer. You will probably want to use a commercial program (rather than writing your own) since the Color Computer has a "software UART" that is difficult to program in BASIC.

Some of the terminal programs available are COLORCOM 64, AUTOTERM and RICKEYTERM (for Coco III). Others are WIZ and XTERM for OS-9.

Radio Shack Model 100/102 and NEC 8201

These computers have built-in terminal programs in ROM. Consult your computer's documentation for instructions in their use.

MFJ-1278B SERIAL PORT PIN FUNCTIONS

This section describes the pins used on the MFJ-1278B RS-232C serial port connector. It is intended for users with special applications requiring hardware handshaking. This information should not be needed by most users.

Pin #	Mnemonic	Name
1	FG	Frame Ground
2	TXD	Transmit Data
3	RXD	Receive Data
4	RTS	Request To Send
5	CTS	Clear To Send
6	DSR	Data Set Ready
7	SG	Signal Ground
8	DCD	Data Carrier Detect
9	---	+ 12V unregulated reference
10	---	- 12V unregulated reference

Table 2-4. RS-232C Pin Designations

Pin 1 Frame Ground

The Frame Ground pin is provided for attachment to the chassis of the MFJ-1278B and the chassis of the attached device (computer or terminal). This pin is available at a feed-through hole on the MFJ-1278B PC board near pin 1 of the serial connector. It is not electrically connected anywhere else on the MFJ-1278B circuit board.

Pin 2 Transmit Data