CHAPTER 3 INTERFACE
B-EP
Series
3-50
(1) Connector pin diagram and signal description
Pin No. Signal name
Function
Signal direction
1
2
SG
Ground line for all data and control signals.
(without the noise filter)
–
3
RXD
Line for data which the host sends to the printer.
Logic “1” is a “Low” level, while logic “0” is a “High”
level.
It is in a “Low (Mark)” state when no transmission is in
progress.
In power save mode, it should be in a “Low (Mark)”
state. If it is in a “High” state, the printer cannot be
returned to the normal state from the power save
mode by opening/closing the cover, or pressing the
[POWER] switch or the [FEED] switch.
←
Host
4
TXD
Line for data which the printer sends to the host.
Logic “1” is a “Low” level, while logic “0” is a “High”
level. It is in a “Low (Mark)” state when no
transmission is in progress. It is in a high impedance
state in power save mode.
Printer
→
5 CTS
N/A
–
6 RTS
N/A
–
7
TEST
The signal is connected with SG.
–
8 N.C
–
(2) Wire connection diagram
[Host]
[Printer]
GND 5
1
SG
RXD 2
2
SG
TXD 3
3
RXD
CTS 8
4
TXD
RTS 7
5
CTS
DCD 1
6
RTS
DTR 4
7
TEST
DSR 6
8
N.C
RI 9
