Fujitsu C145-C037-01EN manual Serial data format, Computer DTE Printer DTE, Cts

5.4.3Serial data format

The format of 10-bit or 11-bit serial data, given in Figure 5.12, consists of a start bit, data bits, a parity bit, and stop bits. A bit is in the mark state when not being transmitted. Data bits start with the least significant bit (LSB). For example, the character “K” (hexadecimal 4B) is transmitted as shown in Figure 5.12 (7 data bits, even parity).

Start				Data bits				Parity	Stop
bit	1	2	3	4	5	6	7	bit	bit(s)

High, +, or Space

Low, –, or Mark

0 1 1 0 1 0 0 1 0 1 (1)

Figure 5.12 RS-232C data format

5.4.4Cable connection diagrams

The connector at the printer side is a 9-pin type. The connector at the computer side is a 9-pin type or a 25-pin type.

Computer (DTE)		Printer (DTE)
CD	(pin 8)	RTS	(pin 1)
RD	(pin 3)	TD	(pin 2)
TD	(pin 2)	RD	(pin 3)
DTR (pin 20)		DSR	(pin 4)
SG	(pin 7)	SG	(pin 5)
DSR	(pin 6)	DTR	(pin 6)
RTS	(pin 4)	#	(pin 7)
CTS	(pin 5)	DTR	(pin 8)
RI	(pin 22)	#	(pin 9)
FG	(pin 1)
	Shell	Shell

# Open wire

Figure 5.13a Example of RS-232C cable wiring (25-pin connector at computer side)

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