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Pin No.
Signal Name
Direction*
17
TTY-TXD
out
24
TTFTXD
Return
Description
High impedance (‘SPACE’)
between pin No. 17 and No
24 or an X-on signal sent
across pin No. 17 and No.
24 indicates that the printer
is ready to accept data. Low
impedance (‘MARK’) or an
X-off signal being sent
indicates that the printer is
busy. Operator can invert
the polarity of this signal
with jumper J5.
—
25
TTY_RXD In
23
Text
—
Return
Input data of serial Current
Loop.
Note
• The column heading “Direction” refers to the direction
of signal flow as viewed from the printer.
• All signals except TTY-TXD and TTY-RXD comply
with the EIA RS-232D standard.
20