Appendix; Specification Of Usb (Universal Serial Bus) Interface; Usb Transmission Specifications - Epson TM-T20 Technical Reference Manual

Appendix

Specification of USB (Universal Serial Bus) Interface

Outline
• Full-speed transmission at 12 Mbps [bps: bits per second]
• Plug & Play, Hot Insertion & Removal

USB transmission specifications

USB function
Overall specifications
Transmission speed
Transmission method
Power supply specifications
Current consumed by USB bus
USB packet size
(with full-speed connection)
Status transmission from printer with USB interface
In order to ensure that there is no lack of status data, it is necessary to periodically retrieve status
data at the host computer.
However, it cannot spontaneously interrupt data transmission to the host computer.
The printer has a 128-byte status data buffer. Statuses that exceed the buffer capacity are
canceled.
According to USB 2.0 specifications
USB Full-Speed (12 Mbps)
USB bulk transmission method
USB self power supply function
0 mA
USB bulk OUT 64 bytes
USB bulk IN 64 bytes
Appendix
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