Campbell CR800 Specifikace stáhnout pdf (Strana 274)

Section 12. Serial Input and Output Functions

12-4

that have used the reverse word order.) Some software packages have a set

setting to work with this original ModBus format. For example, the “Modicon

32-bit floating point order (0123 vs. 3210)” advanced option must be enabled

for the ModBus object in National Instruments’ Lookout.

ModemHangup (ComPort) … EndModemHangup

The ModemHangup and EndModemHangup instructions are used to enclose

code that should be run when a COM port hangs up communication.

Syntax

ModemHangup ( ComPort )

instructions to be run upon hangup

EndModemHangup

Remarks

The ModemHangup instruction indicates the beginning of the code; the

EndModemHangup indicates the ending. The code is entered in the

declarations section of the program, prior to the main program (defined by the

BeginProg/EndProg instructions). When the datalogger detects that a COM

port is hanging up, the ModemHangup code will be run.

This instruction set is most often used with modems that must be sent a

command sequence to disconnect and go into a low power state.

Note that each COM port operates independently; therefore, commands to hang

up modems can be processed concurrently.

ComPort The ComPort parameter specifies the communication port and mode

for this instruction.

This instruction runs sequentially from the processing task sequencer,

regardless of whether the datalogger is in pipeline or sequential mode.

SerialClose (ComPort)

The SerialClose instruction is used to close a communications port that was

previously opened by the SerialOpen instruction.

Syntax

SerialClose (ComPort)

Remarks

If this instruction is set equal to a variable, the result will be True (-1) of the

port was opened or False (0) if it was already closed.

The ComPort parameter specifies the communication port that should be

closed.

This instruction runs sequentially from the processing task sequencer,

regardless of whether the datalogger is in pipeline or sequential mode.

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Campbell CR800 Specifikace Strana 274