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1.4.2 Serial Interface
Synchronization
Signal level
Word format
Baud rate
Handshaking
DTR = MARK, XOFF:
DTR = SPACE, XON:
The DTR signal is MARK and XOFF code (DC3, 13H) is transmitted when the rest of
the input buffer becomes 256 byte. The DTR signal is SPACE and XON code (DC1,
11H) is transmitted when the rest of the input buffer becomes 256 byte.
Error handling
Connector
Table 1-27. Connector Pin Assignment for Serial Interface
Pin No. Signal Name
1
Chassis GND
2
3
RXD
4
7
Signal GND
11
20
others
Note: In and Out refers to the direction of the signal flow from the printer's point of
view.
Rev. A
Asynchronous
EIA-232D
Start bit:
Data bit:
Parity bit: Odd, Even or Non
Stop bit:
300, 600, 1200, 2400, 4800, 9600 or 19200 bps
DTR signal and XON/XOFF
Parity error is detected only.
(Overrun error and framing error are ignored.)
25-pin sub-miniature D-shell connector. (female)
I/O
TXD
Out
In
RTS
Out
REV
Out
DTR
Out
NC
MARK (logical 1):
SPACE (logical):
1 bit
8 bit
1 bit
Indicates that the printer cannot receive data.
Indicates that the printer is ready to receive data.
Function Description
Chassis GND
Transmits data
Receives data
Request to send. Always SPACE level
when the printer is powered on. Pulled
up to +12 V via 4.7 L ohm resistor.
Signal GND
Connected directly to the DTR signal.
Data terminal ready
Not used. Not connected.
Product Description
-3 V to -25 V
+3 V to +25 V
1-33
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