35. APPENDIX F – Communication with barcode scanners
1. For communication with barcode scanners RADWAG moisture analyzers MA
3Y series use RS232 interfaces and simplex transmission (one direction)
without handshaking. Only two wires are required for assuring such a
transmission. Therefore, used scanners should be equipped in such interface
with disabled both hardware and software handshaking.
2. Both moisture analyzers and scanners have the possibility of setting of
transmission parameters. Both devices are required to have the same
parameters set: baud rate, number of data bits, parity control, stop bits.
e.g. 9600,8,N,1 – baud rate 9600 bit/s, data 8-bits, no parity control, 1 stop
bit.
3. Barcode scanners can send additional information apart from the expected
barcode e.g. symbol denoting type of barcode. It is advisable to disable such
information because RADWAG devices and software do not use it.
4. Some RADWAG systems can omit unnecessary information by using
parameters that mark the beginning and the length of the code required to
analyze.
5. Should a barcode be recognized by a moisture analyzer, it needs to have
some particular features. A code requires programming a characteristics
prefix and suffix. In a standard accepted by RADWAG, a prefix is a sign
(byte) 01 hexadecimal and a suffix is a sign (byte) 0D hexadecimal.
6. Most barcode scanners allow to enable/disable different barcode types.
7. Programming of scanners is usually performed by reading special barcodes
or by using an external software tool.
Barcode with required prefix and
suffix in hexadecimal format
Barcode
without
required –fixes
in ASCII format
Code
type
01 30 30 32 31 30 31 32 36 0D 00210126 EAN-8
01 30 31 32 33 34 35 36 37 38 39 0D 0123456789 KOD 2 Z 5
01 43 4F 44 45 20 33 39 20 54 45 53 54 0D CODE 39 TEST CODE 39
01 31 31 30 31 32 33 34 35 36 37 38 39 31 0D 1101234567891 EAN-13
01 43 6F 64 65 20 31 32 38 20 54 65 73 74 0D CODE 128 Test CODE 128
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