Aanderaa ZPulse DCS 4420 - Sensor Start-Up

Page 90 February 2020 – TD 266 OPERATING MANUAL – ZPulse® DCS 4420/4830/4520/4930
6.4 Sensor start-up
When property Enable Text is set to Yes, StartupInfo is displayed at sensor power up or after Reset. StartupInfo
contains this information about Product Number, Serial Number, Mode, Protocol Version and Config Version.
Figure 6-4 Sensor Start-up Information
In order to minimize the current drain the sensor normally enters a power down mode after each sampling; the sensor
can be awakened by any characters on the RS-232 input, and will stay awake for a time set by the Comm TimeOut
property after receiving the last character, refer chapter 1.5.
If the property Comm TimeOut is set to other than ‘Always On’ the serial interface will not be activated after power-up (or the
Reset command). Any character will activate the serial interface, but a Carriage Return (CR or CR+LF), ‘/’ or ‘;’ are often
preferred since these characters do not interfere with the command syntax. The serial interface will then be active until a
period of input inactivity specified by the Comm TimeOut value (10 s, 20 s, 30 s, 1 min, 2 min, 5 min,10 min). The
Communication Sleep Indicator, ‘%’, will be transmitted when the serial communication is deactivated, and the
Communication Ready Indicator, ‘!’ is outputted subsequent to activation (electronics require up to 500ms start up time).
When Comm TimeOut is set to ‘Always On’ the communication (and microprocessor) will be kept active all time.
The Communication Sleep Indicator ‘%’ and the Communication Ready Indicator ‘!‘ are not followed by Carriage
Return and Line Feed.
Any character will cause the electronics to return to normal operation; when the sensor has responded with the
character ‘!’, new commands may be entered.
Enable Old Wakeup Character. Enables old wakeup character `#`instead of `!`. Use Enable Comm Indicator to
switch on and off these characters.
When communicating with the sensor, you must start by pressing Enter. The sensor will respond in two ways (Comm
TimeOut is 1 minute by default in the following description):
• If the sensor is ready for communication, it will not send any response indicator. The sensor will stay awake and
ready to receive commands for 1 minute (controlled by the Comm TimeOut) since the last command.
• If the sensor is in sleep mode and not ready for communication, the sensor will send a ‘communication ready’
indicator (!) when awakened (within 500ms). The sensor will then be ready for communication.
The ‘Communication Sleep Indicator ‘%’ and the ‘Communication Ready’ Indicator ‘!‘ are not followed by Carriage
Return and Line Feed.