Epson EPL-7500 User Manual - Page 190

Apple Talk Interface, You printer is equipped with an 8-pin AppleTalk interface for use

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Signal RS-232C Pin 20 DTR RS-422 22 RING Direction OUT ignored Description Data terminal ready. This pin indicates whether or not the printer is ready to receive data. If the printer ready protocol is not selected, this pin is always high (i.e. the printer IS ready to receive data). If printer ready protocol is selected, the printer can accept data when the pin level is high, and cannot accept data when the pin level is low. When the DTR signal goes low the host computer must stop sending data within 128 characters. Can be set high or low with SelecType. • Although RTS, CTS, DSR, DTR, and DCD are designated as RS232C signals, they can also be used when RS-422 is selected with SelecType. AppleTalk You printer is equipped with an 8-pin AppleTalk interface for use with the Apple Macintosh. 8-16 Technical Specifications

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Signal
Pin
20
RS-232C RS-422
Direction
DTR
OUT
22
RING
ignored
Description
Data terminal ready. This pin indicates
whether or not the printer is ready to
receive data. If the printer ready
protocol is not selected, this pin is
always high (i.e. the printer
IS
ready to
receive data). If printer ready protocol is
selected, the printer can accept data
when the pin level is high, and cannot
accept data when the pin level is low.
When the DTR signal goes low the host
computer must stop sending data within
128 characters. Can be set high or low
with SelecType.
• Although RTS, CTS, DSR, DTR, and DCD are designated as RS232C signals,
they can also be used when RS-422 is selected with SelecType.
AppleTalk
You printer is equipped with an 8-pin AppleTalk interface for use
with the Apple Macintosh.
8-16
Technical Specifications