DP320 User's Manual
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Handshaking:
BUSY and ACKNLG signals
Signal level:
TTL compatible
A.3.2 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.3.3 Serial Interface
The serial interface has the following characteristics.
Baudrate:
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
Synchronization:
Asynchronous
Handshaking:
DTR protocol, XON/XOFF protocol (selectable),
Parity check:
Odd, even, or none (selectable)
Serial pin assignments
The following table lists the serial connector pin assignments and describes their respective interface
signals.
Pin No.
Signal
Direction
Description
1
Protective Ground (FG)
—
Printer’s chassis ground
2
Transmitted Data (TXD/SD) Out
Printer has transmitted serial data
3
Received Data (RXD/RD)
In
Printer has received serial data
7
Signal Ground (SG)
—
Return path for data control signals
20
Data Terminal Ready
(DTR/ER)
Out
Positive when the printer is ready to receive data,
and negative when the printer is not ready
Contact Number
Signal Name
Color
1 VBUS
Red
2 D-
White
3 D+
Green
4 GND
Black
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