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Channel Master Operation Manual

page 46 RD Instruments

10 Channel Master Commands

This section defines the commands used by the Channel Masters. These

commands let you set up and control the Channel Master without using an

external software program such as our WinHADCP program. However, we

recommend you use our software to control the Channel Master because

entering commands directly from a terminal can be difficult. Most Channel

Master settings use factory-set values. If you change these values without

thought, you could ruin your deployment. Be sure you know what effect

each command has before using it. Call RDI if you do not understand the

function of any command.

Using WinHADCP for real-time deployments to develop the command file

will ensure that the Channel Master is set up correctly. The commands di-

rectly affect the range of the Channel Master and the standard deviation

(accuracy) of the data.

10.1 Data Communication and Command Format

You can enter commands with an IBM-compatible computer running RDI’s

BBTalk. The Channel Master communicates with the computer through an

RS-422 serial interface. We initially set the Channel Master at the factory

to communicate at 9600 baud, no parity, and one stop bit.

Immediately after you apply power to the Channel Master, it enters the

STANDBY mode. Send a BREAK signal using BBTalk by pressing the

End key. When the Channel Master receives a BREAK signal, it responds

with a wake-up message similar to the one shown below. The Channel

Master is now ready to accept commands at the “>” prompt from either a

terminal or computer program.

Horizontal H-ADCP

Firmware Version: 28.02z

[prototype]

NOTE. If you use a terminal/program other than BBTalk the BREAK length

(up to down transition) must last at least 300 ms.

10.1.1 Command Input Processing

Input commands set Channel Master operating parameters, start data collec-

tion, run built-in tests (BIT), and asks for output data. All commands are

ASCII character(s) and must end with a carriage return (CR). For example,

>WP0001<CR> [Your input]

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Channel Master CM-6001 Spezifikationen Seite 52