Specifications

４４
SK1-21/31
5．Interfaces
5- 1．USB
(1) Pin layout
Connector: Mini-B type 5-PIN
This printer is equipped with USB version 2.0 for high speed data transfer.
The device class is “Printing Device.”
Pin Signal Direction Function
1 VBUS - Detect connect/disconnect of USB
2 D- I/O USB data (-)
3 D+ I/O USB data (+)
4 N.C
5 GND - GND
（2）Electronic characteristic
Parameter Signal Conditions Min. Max. Unit
（Power supply voltage）
VBUS 4.40 5.25 V
（Input level）
Differential input sensitivity VDI |(D+)-(D-)| 0.2 V
Differential common mode
range
VCM Including VDI 0.8 2.5 V
Single end receiver threshold VSE 0.8 2.0 V
（Output level）
“L”Level VOL RL of 1.5kΩ to
3.6V
0.3 V
“H”Level VOH RL of 15kΩ to
GND
2.8 3.6 V
15