Service manual

Rev. 2.00
- 46 -
SRP-275
3-5-2(c) IEEE1284 I/F Cable
3-5-3 USB Interface
SRP-275 support the USB (Universal Serial Bus) Communication.
3-5-3(a) Specification
Item Description Remark
Transfer type • BULK
Data Signal
• Bi-direction, Half-duplex
• Differential signal pair (D+ / D-)
Data format
• NRZI format
• Zero bit stuffing after 6 ones
Transceiver
• Differential receive sensitivity : 200 mV
• Differential common mode range : 0.8~2.5 V
• Single-end receiver threshold : 0.8~2.0 V
Speed • 12 Mbps
Power • Self-powered
Cable & connector
• Cable : 5m / 2m
• Connector : A/B type
Other • Support USB spec V1.1
3-5-3(b) Signal Description
Pin No. Signal name Assignment (Color) Function
Shell Shield Drain wire Frame ground
1 VBUS Red NC
2 D- White Differential data line
3 D+ Green Differential data line
4 GND Black Signal ground
3-5-3(c) USB I/F Cable