Baracoda BDRS01, Руководство по протоколу связи

Страница: 5 / 10

RS232 dongle Plug & Scan – Communication Protocol v3.27.1 - 5 -
Data Capture
for Workforce
in Motion
1.2. 1.2. 1.2. 1.2.
Generic packet
The dongle will parse data respecting a specific format.
1.2.1. 1.2.1. 1.2.1. 1.2.1. RS232 RS232 RS232 RS232
All the frames incoming to the RS232 dongle are formatted as shown:
Header Code ID Length Payload
4 bytes 1 byte 2 bytes N byte(s)
Frames sent by the dongle via its RS232 link can have other formats.
1.2.1.1. 1.2.1.1. 1.2.1.1. 1.2.1.1. Header Header Header Header
The 4 bytes for the header are always the same: 3C 3A 3F 3E for “<:?>”
1.2.1.2. 1.2.1.2. 1.2.1.2. 1.2.1.2. Code ID Code ID Code ID Code ID
The Code ID, encoded on 1 byte, corresponds to the command to send.
Cf. §2 for complete list of code IDs.
1.2.1.3.
1.2.1.3. 1.2.1.3.
1.2.1.3. Length
Length Length
Length
Depending on the selected code ID the payload length may vary (from 0 to 65535 bytes), its length is
specified on the 2 bytes of the « length » field.
1.2.1.4. 1.2.1.4. 1.2.1.4. 1.2.1.4. Payload Payload Payload Payload
For the « get » commands, no payload is required since the dongle responds with the requested
data. The specified length in the « length » field is then 0 and no byte constitute the payload. When
the sent command is a « set » command, the dongle parses and treats the command if its format is
correct but does not answer.
1.2.2.
1.2.2. 1.2.2.
1.2.2. Bluetooth
Bluetooth Bluetooth
Bluetooth
All the commands described in this document can also be sent via Bluetooth thanks to a Baracoda
barcode scanner by scanning configuration barcodes
Commands respecting the above format can be encoded into Code128 barcodes.
2.
2. 2.
2.
Communication protocol
2.1. 2.1. 2.1. 2.1.
Dongle to HOST messages
Data coming from the dongle can have different formats depending on the mode it is running.