February 2020 – TD 266 OPERATING MANUAL – ZPulse® DCS 4420/4830/4520/4930 Page 91
6.5 Description of protocol
All inputs to the sensor are given as commands with the following format:
• MainCmd SubCmd or MainCmd Property(Value, ..., Value)
Description of ASCII coded communication rules:
• The main command, MainCmd, is followed by an optional subcommand (SubCmd) or sensor property (Property).
• The MainCmd and the SubCmd/Property must be separated with the space ‘ ’ character.
• When entering new settings the Property is followed by a parenthesis containing comma-separated values.
• The command string must be terminated by Carriage Return and Line Feed (ASCII code 13 & 10).
• The command string is not case sensitive (UPPER/lower-case).
• The ENUM property settings are case sensitive. E.g. “Set Mode(AiCaP)” Here AICAP will result in argument error.
• A valid command string is acknowledged with the character ‘#’ while character ‘*’ indicates an error. Both are
followed by Carriage Return/ Line Feed (CRLF).
• For most errors a short error message is also given subsequent to the error indicator.
• There are also special commands with short names and dedicated tasks, as save, reset, and help.
• All names and numbers are separated by tabulator spacing (ASCII code 9).
• The string is terminated by Carriage Return and Line Feed (ASCII code 13 & 10).
Note! Losing power during the flashing process can cause corruption of vital settings, such as coefficients, serial
number, model number etc. If losing settings, contact AADI Service department for new setting file for the specific
sensor with further instructions.
6.5.1 Save and Reset
When the required properties are set, you should send a Save command to make sure that the new configuration is
saved internally in the flash memory. The sensor always reads the configuration from the internal flash memory after
reset and power up. The Save command takes about 20 seconds to complete (indicated with the character ‘#’).
Always send a Reset command when a new configuration has been saved (or switch the power OFF and then back
ON), or else calculated parameters may be corrupted. This forces the sensor to start up with the new configuration
input. If the Enable Sleep property is set to Yes and the Comm TimeOut property is not set to Always On the sensor
enters sleep mode after reset.
At startup/reset the sensor performs measurements according to the interval setting if the mode is Smart Sensor
Terminal. If Enable Text is set to Yes, the Startup Info is presented.
If the Save command is executed the new setting will be stored in the internal Flash memory.
Property changes will be lost when the sensor is reset or loses power unless you type the Save command.
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