3.2 USB INTERFACE SPECIFICATIONS
(1) General
specifications
Item Specification
USB Version
Ver 2.0 conformity
USB Printing class specification
1.1
Communication speed
Full speed
(
12 Mbps
)
Communication protocol
Bulk transfer
(2) Pin
assignment
Pin No.
Name
I/O
Function
1
Vbus
-
USB power supply
2
D-
I/O
USB data signal
3
D+
I/O
USB data signal
4 N.C. -
No
connection
5 GND -
GND
(3) Connector
Mini
B
type
3-4
(4) Data
reception
USB data reception uses a bulk-out transfer method.
The data are received even during the printing operation, and when the data accumulate in the input
buffer by the amount of input 2 packets, the NAK response continues until amount of the input
buffer becomes 129 bytes or more.
The number of bytes that can be received with one packet is maximum 64 bytes. When an error
occurs, the NAK response continues until the error is cleared after receiving data of 2 packets.
For the operation when an error occurs, the setting is changed by Busy Output When Error Occurs at
function setting.
(5) Data
transmission
USB data transmission uses a bulk-in transfer method.
The response data are stored temporarily in the transmission buffer, and a response is made to the
bulk-in packet request from the host device. If no transmission data exist, the zero length data is
returned when the bulk-in request is received. The number of bytes that can be transmitted with one
packet is maximum 64 bytes.
(NOTE) Be aware that if the transmission buffer becomes full, the printer does not print
until the buffer is available.
5
1
Summary of Contents for DPU-S445 SERIES
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