Epson EU-m30 Series, Developer'S Manual

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16
1.15.2 USB interface
(1) USB connector

Type USB upstream port connector (USB type-B connector)

Pin assignments
Pin number Signal name
1 VBUS
2 D-
3 D+
4 GND
Shell Shield
(2) USB communication specifications
(a) USB functions

Overall specifications: Complies with USB 2.0

Communication speed: Full-Speed (12 Mbps)

Communication method: USB bulk transmission method

Power supply specifications: USB self power supply function

Current consumed by USB bus: 2 mA (provided entirely from the main unit)

USB packet size
With full-speed connection
USB bulk OUT:
64 bytes
USB bulk IN: 64 bytes

USB device class
USB vendor-defined class and USB printer class
Switching of the class can be set by the software settings on startup.
(For the setting method, see 3.5.2.)
(b) Receiving the status from the printer

The status of the printer is sent to the host computer via the USB bulk transmission method.

The USB bulk transmission method is a host-controlled transmission method. Unlike RS-232 transmission,
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. In
order to avoid lack of status data, it is necessary to periodically retrieve status data at the host computer.
(c) USB Device Requests of USB printer class

GET PORT STATUS
If this USB device request is requested, the printer returns the following statuses.
Bit Field Description
Reserved Reserved
5 Paper Empty 0: Paper Not Empty
1: Paper Empty
4 Select 1: Select (Fixed)
3 Not Error 0: Error
1: Not Error
2, 1, 0 Reserved Reserved
2
1
4 3
2
1
4 3