BTP-2002NP Installation manual
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2.2.1 Interface Connector
RS-232 serial interface (DB25F)
Pin
Signal
name
Signal
direction
Function
1 FG —
Frame
ground
2
TXD
Output
Transmit data
3
RXD
Input
Receive data
4
RTS
Output
Same as DTR signal
6
DSR
Input
This signal indicates whether the host computer can
receive data.
SPACE indicates that the host computer can receive
data, and MARK indicates that the host computer
cannot receive data.
When DTR/DSR control is selected, the printer
transmits data after confirming this signal (except when
transmitting data by DLE EOT, and GS a).
When XON/XOFF control is selected, the printer does
not check this signal.
7
SG
—
Signal ground
20
DTR
Output
1) When DTR/DSR control is selected, this signal
indicates whether the printer is busy. SPACE
indicates that the printer is ready to receive data,
and MARK indicates that the printer is busy.
2) When XON/XOFF control is selected:
The signal acts the same as when DTR/DSR
control is selected.
