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11-2. Pins and Signal Names
Pin No.
Signal Name
Direction
Function
1
FG
—
Frame ground
2
TXD
OUT
Transmission data
3
RXD
IN
Receive data
4
RTS
OUT
Always space
5
N.C.
Not connected
6
DSR
IN
Dip switch 2-7 = OFF
(1) STAR Mode
Status of this signal is not checked.
(2) 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 = 1:
Status of this signal is not checked.
• In X-ON/X-OFF communication mode, status of
this signal is not checked.
Dip switch 2-7 = ON
This is an externally reset signal.
A mark above 1 ms pulse width engages reset.
7
SG
Signal ground
8 -19
N.C.
Not connected
20
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 6-9
0
1
1. 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
2. During self printing and dot align-
ment adjustment.
BUSY
BUSY
3. 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
