Star Micronics NX-15 user manual ‘s’ L

188

ACK	[ ‘-----------
—.-		1	L—
——	~
STROBE ~		‘-–r–-”
—1			r——————”
‘“s’ L—..—		--l

T: More than 0.5WWC

Figure F-1.The interfacetiming diagram.

Siwd N’ame ! Circuit Ew3mDle

(To Printer)

STROBE‘sat’’”

BUSY,ACK
(From Printer)	‘u:~a’ib’e

Figure F-2.Typicalinterfacecircuit.

When the printer has successfully received the byte of data from the computer it sets pin 10 low for approximately 2.75 microseconds (15 microseconds when using the optional buffer board). This signal acknowledges the receipt of the data and so is called the ACK (for “acknowledge”) signal.

Pin 11 reports when the printer is not able to receive data. The signal is called BUSY. When this signal is high, the printer cannot receive data. This signal will be high during data transfer, when the printer is off-line and when an error condi- tion exists.