DP350 User's Manual
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A.2 Interface Specifications
Your printer is equipped with a parallel interface, two USB interfaces and an option among a serial interface
or Ethernet interface. The printer switches automatically to the appropriate interface when it receives data.
A.2.1 Parallel Interface
A.2.2 USB Interface
The following table provides the standardized contact terminating assignments by number and color for
Series “A” and Series “B” connectors of Full-speed USB 2.0.
A.2.3 Serial Interface
The serial interface has the following characteristics:
Baudrate (bps)
：
1200 bps,2400 bps,4800 bps 9600 bps,19200 bps (selectable)
Word length
：
7 or 8-bit (selectable)
Start bit
：
1 bit
Parity bit
：
Odd, even, or none (selectable)
Stop bit
：
1 bit
Handshaking
：
DTR protocol, X-ON/X-OFF protocol (selectable)
Serial pin assignments
The following table lists the serial connector pin assignments and describes their respective interface
signals.
The parallel interface has the following characteristics:
Data format
：
8-bit
Synchronization
：
/STROBE pulse
Handshaking
：
BUSY and /ACKNLG signals
Signal level
：
TTL compatible
Contact Number
Signal Name
Color
1 VBUS
Red
2 D-
White
3 D+
Green
4 GND
Black
Figure A-1 Parallel interface connector pin number
2 1
3 4
Figure A-2 USB-B type connector
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