2. pins and signal names – Oki Pos 441 User Manual
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11-2. Pins and Signal Names
Pin No.
Signal Name
Direction
Function
FG
—
Frame ground
TXD
OUT
Transmission data
RXD
IN
Receive data
4
RTS
OUT
Always space
5
N.C.
Not connected
6
DSR
IN
Dip switch - = OFF
() STAR Mode
Status of this signal is not checked.
() ESC/POS Mode
• In DTR/DSR communication mode
Memory Switch 4-5 = “0”:
signal line indicating whether host is
enabled or disabled to receive data is
checked.
Space:
Host enabled to receive
Mark:
Host disabled to receive
Memory switch 4-5 = :
Status of this signal is not checked.
• In X-ON/X-OFF communication mode, status of
this signal is not checked.
Dip switch - = ON
This is an externally reset signal.
A mark above ms pulse width engages reset.
SG
Signal ground
-
N.C.
Not connected
0
DTR
OUT
Indicates whether data receive from host is enabled or
disabled.
DTR/DSR Communication Mode
Space when receive is enabled.
Printer status
Memory switch 6-
0
. During the period from when
the power is turned on (includ-
ing resetting using the interface)
to when the printer is ready to
receive data.
BUSY
BUSY
. During self printing and dot align-
ment adjustment.
BUSY
BUSY
. When the printer stops printing
due to a paper end or an optional
paper near end.
BUSY
—
4. When an error has occurred.
BUSY
—
5. When the receive buffer becomes
full.
BUSY
BUSY