Cino FA470 - Manual (Page 106)

Command Descriptions
2-91
Get USB COM
(WF)
Descriptions
Request the desired one or more parameters of the USB COM Interface settings
Available for F & L series
Packet Format
Prefix Opcode Status Length Parameter(s) LRC Suffix
7Eh C3h 00h 03h 00h Variable See Below Variable 7Eh
1 Byte 3 Bytes 1 Byte 2 Bytes Variable 1 Byte 1 Byte
Parameter(s)
First Parameter ……… Last Parameter
PID Size ……… PID Size
2 Bytes 2 Bytes ……… 2 Bytes 2 Bytes
See Next Page
. Host Requirements
If the device successfully received the above command issued by the host, the device will pack all
requested parameters into a “Reply USB COM” message string then send to the host. Please refer to
the “Reply USB COM” command for details. Otherwise, a “Device NAK” will be sent to host to indicate
issue a command error. However, if the host can receive any response from the device within the user
preset time-out duration, please resend the above command.
. Parameter(s) Field
Get USB COM can request multiple parameters at one time, so it takes compound parameters.
. Length
Total size (bytes) of the Parameter(s) field
. LRC
”Opcode” XOR “Status” XOR “Length” XOR “Parameter(s)”
. Size
Total size (bytes) of the Options field