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TOA VS-900 Programmer’s Guide
5
Communication Specifications
Transmission System: Half-duplex
Baud Rate: 19,200 Bps
Transmission Format: <1 Start Bit> <8 Data bits> <1 Even Parity Bit> <1 Stop Bit>
Message Packaging
Field Name Value Description Direction
DLE
10H Delimiter
ENQ
05H Enquiry
VS-900 to PC or
PC to VS-900
DLE
10H Delimiter
ACK
06H Acknowledge
VS-900 to PC or
PC to VS-900
DLE
10H Delimiter
STX
02H Start of Text
Message*
Varies Remote Dial, Data Log
Request or Data Log
DLE
10H Delimiter
ETX
03H End of Text
BCC**
Varies Block Check Character
VS-900 to PC or
PC to VS-900
DLE
10H Delimiter
ACK
06H Acknowledge
VS-900 to PC or
PC to VS-900
DLE
10H Delimiter
EOT
04H End of Transmission
VS-900 to PC or
PC to VS-900
* See the Remote Dial, Log Data Request or Log Data sections for more information.
** To calculate BCC, take the XOR of the combined Message, DLE, and ETX. (Refer to the shaded area
below). MS Windows Calculator (Scientific mode) is a useful tool for this function.
DLE STX
MESSAGE DLE ETX BCC