BC Biomedical DPM-2100 Manual de usuario descargar pdf (Pagina 18)

Since the meter does not handle a great deal of data, the RS-232 communications link

has been optimized to allow the user, through very simple instructions, to control and

request data from the meter. Refer to Specifications section for RS-232 Settings (Baud,

etc).

Data transmitted/received is in standard ASCII format, and all numerical values are in

BCD format. All commands sent to the unit should be terminated with a “Carriage

Return” character (<CR> or in hexadecimal, 0x0D). All commands and responses are

echoed by the unit for confirmation of communication, and are terminated with

“Carriage Return” and “Line Feed” characters (<CR><LF> or in hexadecimal, 0x0D0A).

If an invalid command is received, the unit will respond with the characters “??”.

The following section describes the protocol used by the meter in detail:

R - READ

The READ command allows the user to read system settings and

data.

Usage:

R(Location)(CR)

Where:

R - READ command

Location - contains two digits indicating the data location to be

read

CR - Carriage Return

Example:

Data Sent Data Returned Meaning

R11<CR> R11<CR><LF> Echo of Command Sent

-0011<CR><LF> -0.11 PSI measured

W - WRITE

The WRITE command allows the user to update the system settings.

Usage:

W(Location – 2 digits)(Data – 5 digits)(CR)

Where:

W - WRITE command

Location - contains two digits indicating the data location to be

written

Data – five-digit field containing the data to be written at the

Location set above

CR - Carriage Return

COMMUNICATIONS

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BC Biomedical DPM-2100 Manual de usuario Pagina 18