Metrohm 765 Dosimat User Manual download pdf (Page 37)

4.1 General

765 Dosimat

4 Operation via RS232 Interface

4.1 General

The Dosimat offers an extensive remote control. Data transmission occurs via an interface

according to RS 232 C in half duplex procedure.

The syntax of the commands is based on the following principles:

• Commands are strings which always begin with a letter.

• Only the first three letters are significant, string length is unlimited.

• Actual parameters have to be separated by a space from the preceding command.

• The input range for numbers is -1E33 ... -1E-37, 0, 1E-37 ... 1E33.

Examples of possible numbers: 3.567

-.5

5.E4

-123.45E-12

• Set 'CR' + 'LF' at the end of a complete command.

'CR': carriage return (ASCII sign No. 13)

'LF': line feed (ASCII sign No. 10)

• All commands, where the Dosimat has to send data, begin with letter 'Q' (query).

• Each string sent by the Dosimat ends with 'CR' + 'LF'.

• Set handshake up for every character (asynchronous transfer).

There are several exceptions in order to avoid problems with time:

• The commands GO, STOP, FILL, CLEAR, and INFORMATION are so-called 1-byte

commands. They are simply transmitted as 'G', 'S', 'F', 'C', and 'I' . No separating and

terminating signs are necessary.

• With command 'I' (Information), the Dosimat sends two information bytes containing

the information READY, CODE, LOCK, LIMIT etc. see 4.2.7.

• Several commands can be transmitted "live", i.e. during a running function. All other

commands are recognized only if the Dosimat is in its ready state, see 4.2. If

commands are not recognized, the corresponding error bytes of information byte 2 are

set and may be inquired with command 'I'.

1 2 ... 32 33 34 35 36 37 38 39 40 41 42 ... 65 66

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Metrohm 765 Dosimat User Manual Page 37