Laurel-electronics LAUREATE SERIES Serial Comunications Manual de usuario descargar pdf (Pagina 9)

2.0 INTERFACE INFORMATION

The series of DPMs and counters offers RS232 or RS485 serial communication interface boards

that may be connected by cable to computers, remote displays, printers or other digital devices

having similar serial communication capability. Software is available for use with an IBM-

compatible PC/XT/AT computer that simplifies the logging of measurement data on the computer

and provides capability for the remote setting of parameter values in lieu of using the front panel

menu setup.

3.0 RS232 AND RS485 FORMAT

3.1 SERIAL COMMUNICATION FORMAT

The serial communication format for both RS232 and RS485 is the following:

Mode Full Duplex (Separate transmit and receive lines) and Half Duplex (RS485

only)

Baud Rate 300, 600, 1200, 2400, 4800, 9600, 19200 selectable by front panel Menu

item “Ser 1”, Sub-menu item “Digit 4” for DPM, "Digit 5" for counter.

Parity None

Word length 8 data bits

Stop bit 1

3.2 MEASUREMENT DATA FORMAT

The basic measurement data format consists of 8 ASCII characters:

(shown for DPM, add 1 more digit for counter)

+999.99<cr> where <cr> is the carriage return character

Notes: The first character is always a plus or minus sign, and a decimal point is always

furnished, even when it follows the last digit and is not required.

Adding a Line Feed Character to the Basic Format

Printers and other devices that receive the measurement data sometimes require a line feed

character <lf> following the carriage return character <cr>. The line feed may be selected in "Ser

Adding a Coded Data Character to the Basic Format

It is also possible to add a coded character to the data format to indicate the alarm, overload and

zero-blanking status of the meter. If used, this character precedes the <cr> so it is the last printable

character in the format (<cr> and <lf> are control characters and are not printable). This coded

character may be selected in "Ser 2"

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Laurel-electronics LAUREATE SERIES Serial Comunications Manual de usuario Pagina 9