Mindeo FS580 - 5 Serial Communication Interface

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5 Serial Communication Interface
Note: SCI is supported for RS232 interface or USB virtual COM only.
This section describes the system requirements of the Serial Communication Interface (SCI), which
provides a communication link between a scanner and a host via RS232 interface or USB virtual COM.
SCI allows the host to configure the scanner. All communication between the scanner and the host occur
over the hardware interface lines using the SCI protocol.
The host and the scanner exchange messages in packets. A packet is a collection of bytes framed by
the proper SCI protocol formatting bytes. The maximum number of bytes per packet allowed by the SCI
protocol for any transaction is 257 (255 bytes of data + 2 bytes of checksum).
Decode data may be sent as ASCII data (unpacked), or as part of a larger message (packeted),
depending on the scanner configuration.
Table 5-1 SCI commands
No.
Command name
Operation code
Description
1
BEEP
0x42(‘B’)
Sound the beeper.
2
CMD_ACK
0x59(‘Y’)
Positive acknowledgement.
3
CMD_NAK
0x4E(‘N’)
Negative acknowledgement.
4
DECODE_DATA
0x50(‘P’)
Decode data in SCI packet format.
5
LED_CTR
0x4C(‘L’)
Turn on/off the led.
6
REQUEST_REVISION
0x56(‘V’)
Request scanner’s software revision.
7
REPLY_REVISION
0x52(‘R’)
Reply scanner’s software revision.
8
START_DECODE
0x53(‘S’)
Tell scanner to attempt to decode a barcode.
9
STOP_DECODE
0x45(‘E’)
Tell scanner to abort a decode attempt.
10
PARAM_DEFAULT
0x25(‘%’)
Load scanner’s default settings.
11
PARAM_REQUEST
0x3F(‘?’)
Request values of certain parameters.
12
PARAM_SEND
0x23(‘#’)
Parameter transmission.
13
CUSTOM_DEFAULTS
0x26(‘&’)
Custom defaults option to write/restore.
14
CMD_RESTART
0x5e(‘^’)
Tell scanner to restart as soon as possible.
15
WAKUP
N/A
Wakeup scanner after it has been in sleep state.
16
CMD_OUTPUTBUFFER_CTR
0x62(‘b’)
Control output buffer.