Confidential
EPSON
TITLE SHEET
REVISION NO
SHEETNEXT
17 16
TM-T81
Specification
(STANDARD) A
2.1.2 USB (Universal Serial Bus) Int erface
Outline
1. High-speed transmission at 12 Mbps [bps: bits per second]
2. Plug & Play, Hot Insertion & Remov able
2.1.3.1 USB transmission specification s
1) USB function
Overall specificati ons: according to USB 2.0 specifications
Transmission speed: USB Full-Speed (12 Mbps)
Transmission method: USB bulk transmission method
Power supply specifications: USB self power supply function
Current consumed by USB bus: 0 mA (provided entirely f rom the unit)
USB packet size
With Full-Speed connection: USB bulk OUT (TM) 64 byt es
USB bulk IN (TM) 64 bytes
2) Status transmission from printer with USB int erface
With this interface, the status of the pri nter is transm itted t o the host computer vi a the USB bulk
transmission method.
The USB bulk transmission method is a host-contr olled transmission method. Unli ke RS232
transmission, it cannot spontaneously interrupt dat a t ransmission to the host computer.
The printer has a 128-byte status data buffer. Statuses that ex ceed the buffer capaci ty are
cancelled. In order to ensure that there is no lack of status data, it is necessary to
periodically retrieve stat us dat a at the host computer.