Citizen Systems iDP-3540, 3541 user manual 8V Busy TD Mark = -8V +8V Ready Space = +8V

iDP-3540/41 User’s Manual

9-3-6. Electrical Characteristics

a)RS-232C Circuit Input (RD)

[Printer Side] [Host Side]

MAX232 or equivalent	Mark = (-8V): Stop bit
	Space = (+8V): start bit
Output (DTR, TD, FAULT)
[Printer Side]	[Host Side]

	MAX232 or equivalent
DTR	(-8V): BUSY	*TD Mark = (-8V): 1
	(+8V): READY	Space = (+8V): 0
FAULT	(-8V): Normal
	(+8V): Abnormal

b)TTL Circuit Output (PE)

[Printer Side] [Host Side]

	7406 or equivalent
PE	H: Paper empty
	L: Paper remaining
Input (RESET)
	[Printer Side]	[Host Side]

7406 or equivalent LOW for RESET

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