Toshiba T2150CD user manual Cabling, Communication Settings

Cabling

The computer’s RS-232-C serial port is an IBM PC style serial interface. It has an IBM PC AT, D-shell, male connector. This connector has 9 pins instead of the conventional 25 pins.

To connect any serial device to the computer, you need the same cable that you would use to connect that device to an IBM PC XT. Your dealer should be able to provide this type of cable. If you can’t get an IBM PC XT style cable, you may need to have a custom made cable.

The pin assignments for the computer serial port are:

Pin	Signal	I/O	Description
1	DCD	I	Data carrier detect
2	RD	I	Serial receive data
3	SD	O	Serial transmit data
4	DTR	O	Data terminal ready
5	GND		Signal ground (0 V)
6	DSR	I	Data set ready
7	RTS	O	Request to send
8	CTS	I	Clear to send
9	RI	I	Ring indicator

Communication Settings

There are other considerations in serial communications. They include:

The computer’s internal configuration. (MS-DOS must know which logical serial port, COM1 or COM2, should receive and send data.)

The internal configuration of the peripheral device.