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User’s Guide
Interface Specifications B-9
SIGNAL P/N NO MODEM CONTROL MODEM CONTROL
DTR 20
11
When the printer is ready to
accept data, this line will be high
(+EIA LEVEL). This line will go
low (-EIA LEVEL) when:
a. Print buffer is nearly full
(within 512 bytes)
b. Paper out condition exists.
c. Carriage jam condition
detected.
d. Printer is off line.
When the printer is ready to
accept data, this line will be high
(+EIA LEVEL). This line will go
low (-EIA LEVEL) when:
a. Print buffer is nearly full
(within 512 bytes)
b. Paper out condition exists.
c. Carriage jam condition
detected.
d. Printer is off line.
RTS 4 This signal will always be held
high
RTS will be held high when the
interface is ready to transmit data.
CTS 5 CTS is always assumed high The interface will monitor the
CTS signal generated by the host
in response to RTS. When this
signal goes on (high), the host is
ready to receive data.
DSR 6 DSR is always assumed high If DSR is low, the interface will
ignore all data received on the
serial port. This signal must hold
high for the interface to receive
and transmit data.
DCD 8 Same as DSR Same as DSR