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(2) Pin Assignment
Terminal
No.
1
2
3
4
Shell
(NOTE) Use a USB cable that conforms to the Full speed when you prepare a cable
separately.
(3) Connector
Printer side connector: UBB-4R-D14T-4D(LF)(SN) (JST) or equivalent (Series B)
(4) Data Reception
USB data reception uses a bulk-out transfer method.
Data is received during printing. However, since printing is prioritized, the NAK response may be
returned even when there is free space in the input buffer.
When the input buffer usage becomes 3840 bytes or more (the remaining capacity becomes 256 bytes
or less), the NAK response continues. When the data process is proceeded, and the input buffer usage
becomes 3712 bytes or less (the remaining capacity becomes 384 bytes or more), data reception
resumes.
The maximum number of bytes that can be received with 1 packet is 64 bytes. Data reception is
available during an error.
(5) Data Transmission
USB data transmission uses a bulk-in transfer method.
The response data is stored temporarily in the output buffer, and it is sent in response to the bulk-in
packet request from the host device. When the bulk-in packet request is received while no response
data exists, zero-length packet is sent.
The maximum number of bytes that can be transmitted with 1 packet is 64 bytes.
Table 3-2 Pin Assignment of USB Interface
Terminal
Input/Output
Name
Direction
Vbus
-
D-
Input/Output
D+
Input/Output
GND
-
FG
-
Figure 3-1 Connector
Function
USB power supply
USB data
USB data
Signal ground
Frame ground
3-2
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