Crystal XP2i-DP Digital Differential Pressure Gauge Uživatelský manuál stáhnout pdf (Strana 11)

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XP2i Programming Instruction Manual

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EFFECTS OF PASSWORD PROTECTION ON COMMANDS

If the XP2i is password protected, the following commands will have no eect and return “X,0”:

!_4C, !60F, !68F, !NPK, !PKS, !MSG, !RAS, and !AVS.

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PROGRAMMING TIPS

The XP2i is a very straightforward device to communicate with, provided you follow these tips. This advice is derived from our own experiences automating

systems based on the XP2i, as well as the experiences of our users; following these tips will help save you some time.

Anytime you establish (or re-establish) communications with the unit, you should use the following initialization sequence, which will help you deal with

possible noise due to reset, etc.:

Reset the unit (unless you must preserve zero, peak values, etc.) by sending the “

!RST” command.

2 Wait 15 seconds.

3 Read the Bootloader Signature, even if you ignore it, to clear it from the PC’s input buer; see below for more details.

4 Send a carriage return to clear any noise in the XP2i’s input buer.

5 An error code, either “

N,Ø” or “N,4” will be returned; this is normal (you have sent an empty command); read it to clear it. The buers are now reset.

6 Use the “

?P,U” and “!I,P” commands to select the pressure unit you want to use.

7 IF APPROPRIATE, zero the XP2i by sending the “

!ZER” command, since the zero value will be clear.

8 IF APPROPRIATE, clear the high and low peak values to the current pressure (zero, if you followed step 6) by sending the “

!CLR” command.

9 If you are logging data, you should log the serial number of the unit for traceability purposes by using the “

?SN#” command.

You should also log the product code, hardware revision and rmware version with the “

?VER” command.

10 Disable automatic shutdown with the “

!NAO” command.

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