Crystal XP2i-DP Digital Differential Pressure Gauge Manual de usuario descargar pdf (Pagina 10)

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XP2i Programming Instruction Manual

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TROUBLESHOOTING THE DIGITAL INTERFACE

The following section gives possible reasons for various error codes.

N,Ø . . . . . . . . .The “Ø” indicates there were no overrun or framing errors, so the command was properly received. However, the “N” means the XP2i could not

match it to any allowed command. This means the syntax must have been wrong. The command is rejected and nothing is done.

Possible reasons:

•

Instruction sent without a comma between “P” and “U” of the “?P,U” query.

•

More than 30 seconds passed to nish a command.

•

Line termination is incorrect; send carriage returns (CR) only, do not send line feeds (LF).

N,2 . . . . . . . . .XP2i buer overow, no action. In an overrun, bytes are lost, consequently the XP2i will not be able to match the command string. If it can’t nd

a match, it returns “

N”.

Possible reason:

•

Not enough time allowed between commands. Check the communication parameters.

N,4 . . . . . . . . .Framing error: Bytes were lost. Therefore, the command could not be matched. A framing error can sometimes occur after power-on, after reset,

or when the batteries are changed; see the Programming Tips on page 9 for suggestions on handling this.

Possible reasons:

•

Noise on the line either created a false start bit or obscured the stop bit.

•

Multiple, but infrequent, framing errors are probably due to noise on the connection.

•

Frequent framing errors likely mean the XP2i or the PC is not operating at precisely 9600 Baud.

•

Occasionally, plugging the RS-232 connection into the XP2i will create a single framing error.

N,6 . . . . . . . . .Both buer overrun (N,2) and framing errors (N,2) occurred during this command. The “6” represents the binary OR masking of the two bits

used to indicate a buer overrun (bit 1) and a framing error (bit 2).

Possible reason:

•

Look at “Possible reasons” for troubleshooting the N,2 and N,4 error codes, above.

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Crystal XP2i-DP Digital Differential Pressure Gauge Manual de usuario Pagina 10

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