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 1.5k
Ω
to
3.6V
0.3 V
“H”Level
VOH
RL of 15k
Ω
to
GND
2.8 3.6 V
1
5
