Unitech MS338, Руководство пользователя

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15
3-3 Operate
the scanner by receiving command via UART
Note:
1- The information in this chapter is provided for the scanner with RS232 cable or USB cable.
2- If the scanner is with USB cable, the setting of USB device type must be set as
“USB virtual
COM
”. Please refer to
3-6 USB interface .
3- Please read 3-7 Scan mode & some global settings about the setting of Scan mode in details.
UART parameter should be set as below:
(1)
Baud rate: 9600 bps;
(2)
Data bits: 8 bits;
(3)
Stop bit: 1 bit;
(4)
Parity check bit: None;
(5)
Flow control: None.
Guide of control command: all commands are sent by UART
1) Start command:
“0x54” (T)
When the scanner received the above command, it will start barcode scanning following the setting
of Scan mode. If the scanner is in the mode of
“Auto-detection”, the scanner will have a single
scan, then returns to
“Auto-detection” mode.
2) Stop command:
“0x50” (P)
If the Scan mode is set as
“Alternate continue” or “Continue”, and the scanner received the above
command, it will stop barcode scanning and act as in an idle mode.
3) Restart command:
“0x35” (R)
Once the scanner received the above command, it will restart.
Returning message from the scanner
1) A successful decode
Once the scanner successfully decoded a barcode, the scanner will stop scanning and returns
the barcode data to the Host.
2) Not a successful decode
Once the scanner failed to decode a barcode before stopping scanning, the scanner will return a
message to the Host. The message is set as
“0x25, 0x25, 0x4E, 0x6F, 0x52, 0x65, 0x61, 0x64”
(%%NoRead).