TOA VS-900 Programmer’s Guide

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

DLE

ENQ

DLE

ACK

DLE

STX Message*

DLE

ETX

BCC**

DLE

ACK

DLE

EOT

Value

10H

05H

10H

06H

10H

02H Varies

10H

03H Varies 10H 06H 10H 04H

Description

Delimiter

Enquiry

Delimiter Acknowledge Delimiter Start of Text

Remote Dial, Data Log Request or Data Log Delimiter

End of Text

Block Check Character Delimiter Acknowledge Delimiter

End of Transmission

Direction

VS-900 to PC or

PC to VS-900

VS-900 to PC or

PC to VS-900

VS-900 to PC or

PC to VS-900

VS-900 to PC or

PC to VS-900

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

5

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Vizio VS-900 manual Communication Specifications, Message Packaging, STX Message