Epson TM-T88IV TM-T88IV Technical Reference Guide - Page 89

USB (Universal Serial Bus) Interface, Outline, USB transmission specifications

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Appendix USB (Universal Serial Bus) Interface Outline • Full-speed transmission at 12Mbps [bps: bits per second] • Plug & Play, Hot Insertion & Removable 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) USB bulk OUT (TM) USB bulk IN (TM) According to USB 2.0 specifications USB Full-Speed (12 Mbps) USB bulk transmission method USB self power supply function 0 mA 64 bytes 64 bytes 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. Unlike RS232C 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 cancelled. 89

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Appendix
89
USB (Universal Serial Bus) Interface
Outline
•F
u
ll-speed
t
ra
n
sm
i
ss
i
o
n
a
t
12Mbps [bps: b
it
s per seco
n
d]
• Pl
ug
& Play, Ho
t
I
n
ser
ti
o
n
& Removable
USB transmission specifications
USB function
Status transmission from printer with USB interface
I
n
order
t
o e
n
s
u
re
t
ha
t
t
here
i
s
n
o lack of s
t
a
tu
s da
t
a,
it
i
s
n
ecessary
t
o per
i
od
i
cally re
t
r
i
eve s
t
a
tu
s
da
t
a a
t
t
he hos
t
comp
ut
er.
U
n
l
i
ke RS232C
t
ra
n
sm
i
ss
i
o
n
,
it
ca
nn
o
t
spo
nt
a
n
eo
u
sly
int
err
u
p
t
da
t
a
t
ra
n
sm
i
ss
i
o
n
t
o
t
he hos
t
comp
ut
er.
The pr
int
er has a 128-by
t
e s
t
a
tu
s da
t
a b
u
ffer. S
t
a
tu
ses
t
ha
t
exceed
t
he b
u
ffer capac
it
y are
ca
n
celled.
Overall specifications
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
USB packet size (with full-speed connection)
USB bulk OUT (TM)
64 bytes
USB bulk IN (TM)
64 bytes