4
There is power supply, indicators of status, buzzer, cutting socket, Feed button and so on. We will
take the example with serial port to introduce other PCB board.As the following Figure3-1.
3.1 Description for PBC board buttons and ports
Fig3-1 SP-EU58III
3.2 The appearance and pin assignment of default serial port
The appearance of the default serial port is as the figure 3-1.It is a single-line serial socket with
five pins and definition of each pins is as following:
5
4
3
2
1
Fig3-2 5 pins sequence number of the single- row serial port
Definition for interface pins:
PinNo.
Signal
Source
Description
1
DTR
Printer
Signal “MARK” indicates that the printer is
“BUSY” and unable to receive data; “SPACE”
Indicates that the printer is “READY”
For receiving data.
2
TXD
Printer
Printer transmits data to host, and transmits control
code X-ON/X-OFF when using X-ON/X-OFF
handshake protocol
3
RXD
Host
Printer receives data from host
Cutting socket
Printer head socket
Feed button
Serial port
USB port
Power socket
Indicators of status (RED)
