DPP-255 Mobile Printer User Manual
Page 36 of 48
UM-00017 Version: A
USB
(1)
Pin layout:
Connector:
Mini-B type 5-PIN
Cable:
Use specified serial cable
Pin
Signal
Function
RxD
Input
Serial data input
TxD
Output
Serial data output
GND
--
GND
(2)
Conditions:
Baud rate: 1200 to 115200bps
Parity: None
Bit length: 8 bit
Busy control: Software control(XON/XOFF) / None
(3)
Software control (XON/XOFF):
Xon(11H) / Xoff(13H) signal is used to control data transmission to the host system.
Xoff signal is sent to host system if the receiving buffer is filled out curtain level (1).
The host side should stop sending data if Xoff signal is received. If the data in the input
buffer is reduced to curtain level, Xon signal is sent to the host system and re-start sending
remained data (2)
Figure 22: USB - Software Control Diagram