Star Micronics CBM-820 manual Interface Connections, D-sub 25 pin

Pin	Signal	Direction		Function
No.	Name
20	DTR	OUT	Indicates whether data receive from host is enabled or disabled.
			DTR/DSR Communication Mode
			Space when receive is enabled.
			X-On/X-Off Communication Mode
			Always space, except during following conditions:
			•	Period between reset and communication enabled
			•	During self-test printing and dot alignment adjustment
21 - 24	N.C.		Not connected
25	INIT	IN	•	DIP Switch 10 = OFF
			This signal not used.
			•	DIP Switch 10 = ON
			This signal becomes reset signal. Printer is reset whenever signal is in mark state with
			pulse width of 1mS or more.

6.2 Interface Connections

Refer to the interface specifications of the host for details on connecting to its interface connector. The following illustration shows a typical connection configuration.

	Printer side		IBM PC side
(D-sub 25 pin)		25 pin	9 pin
F-GND	1	1		F-GND
TXD	2	2	3	TXD
RXD	3	3	2	RXD
RTS	4	4	7	RTS
		5	8	CTS
DSR	6	6	6	DSR
S-GND	7	7	5	S-GND
DTR	20	8	1	DCD
INIT	25	20	4	DTR

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