Laurel-electronics Custom ASCII Protocol For Laureate Series 2 Digita Manuale Utente Scaricare il pdf (Pagina 16)

7. CUSTOM ASCII COMMUNICATION PROTOCOL

7.1 SERIAL COMMUNICATION FORMAT

The Custom ASCII serial communication format for RS232, RS485 and USB is the following:

Duplex ...................... Full duplex for RS232 & RS485. Half duplex selectable for RS485.

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

7.2 MEASUREMENT DATA FORMAT

The basic measurement data format consists of 8 ASCII characters for the DPM, such as

<SP>999.99 <CR> and 9 characters for the counter, such as <SP> 9999.99<CR>, where <SP>

is the space character and <CR> is the carriage return character. The first character is always a

space character or minus sign. A decimal point is always furnished, even when it follows the

last digit.

Adding a Line Feed Character to the Basic Format

Printers and other devices that receive the measure-

ment data may require a line feed character <LF>

following the <CR>. The line feed character may be

selected in “Ser 2”.

Adding a Coded Data Character to the Basic Format

It is possible to add a coded character from A to h to

the data string according to the table to the right to

indicate the alarm and overload status of the device.

If used, this character precedes the <CR>, so it is the

last printable character in the string. With the

optional <LF> and coded character selected, the data

string will consist of 10 characters for the DPM:

<SP>999.99A<CR><LF> and 11 characters for the

counter: <SP>9999.99A<CR><LF>.

For example, a coded character “G” indicates that

Alarm 2 only is set and that the DPM is in overload

condition. This information is useful when data is

supplied to a computer for listing and analysis, or when data is supplied to a Remote Display in

a Master-Slave configuration.

Alarm #

4 3 2 1

Alarm with

No Overload

Alarm with

Overload

0 0 0 0

0 0 0 1

0 0 1 0

0 0 1 1

0 1 0 0

0 1 0 1

0 1 1 0

0 1 1 1

1 0 0 0

1 0 0 1

1 0 1 0

1 0 1 1

1 1 0 0

1 1 0 1

1 1 1 0

1 1 1 1

1 2 ... 11 12 13 14 15 16 17 18 19 20 21 ... 55 56

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