Laurel-electronics LTM CTR SERIES PULSE, AC or PROCESS TOTALIZER INPU User Manual download pdf (Page 33)

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18. CUSTOM ASCII PROTOCOL TRANSMITTER COMMUNICATIONS

1.0 SERIAL COMMUNICATION FORMAT

The Custom ASCII 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 with Instrument Setup

software.

Parity ................ None

Word length...... 8 data bits

Stop bit ............ 1

2.0 MEASUREMENT DATA FORMAT

The basic measurement data format consists of 8 ASCII characters for analog input “DPM”

transmitters, such as +999.99<CR>, where <CR> is the carriage return character. The first

character is always a plus 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 data may require a line feed character <LF> following

the <CR>. The line feed character <LF> may be selected using Instrument Setup software.

Adding a Coded Data Character to the Basic Format

A coded character from A to H may be added to the data string according to the table below to

indicate the alarm and overload status of the device. If used, this character precedes the <CR>,

so that 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 analog input “DPM”

transmitters, such as +999.99A<CR><LF>.

Alarm Status No Overload Overload

Neither Alarm set

Alarm 1 set only

Alarm 2 set only

Both Alarms set

For example, a coded character “G” indicates that Alarm 2 only is set and that the transmitter is

in the 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 confi-

guration.

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Laurel-electronics LTM CTR SERIES PULSE, AC or PROCESS TOTALIZER INPU User Manual Page 33