Contrex ML-Drive Manual de usuario descargar pdf (Pagina 86)

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Communications Software Design

The ML-Drive Serial Communications Interface uses a polling technique to establish a

link with the host computer. With the exception of Keypad Lockout (CP-98), all of the

Control Parameters and Monitor Parameters that are accessible through the ML-Drive's

front panel keypad are also accessible through the Serial Communications Interface.

The host computer sends a twelve character record to the ML-Drive to establish the link

and the ML-Drive responds with either a conformation or an error message. Once the

ML-Drive responds, the host computer can send additional transmissions.

All of the ML-Drive's messages use the USA Standard Code for Information

Interchange (ASCII). The host computer sends three types of messages;

Parameter Send - To change CPs.

Control Command Send - To control operating states.

Data Inquiry - To monitor CPs and MPs.

These three message types, their character level descriptions in binary and ASCII, as

well as the ML-Drive's response record, are outlined in the sections that follow.

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Contrex ML-Drive Manual de usuario Pagina 86