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SERIAL INTERFACE (OPTION)
12 - 2
ETC00781(1) Series 100 e 10/2001
Rosemount Analytical
12.2 General
The analyzer is equipped with a serial interface enabling communication with a host computer.
The host computer can call up, prescribe, or alter parameters as well as initiate analyzer
operations, using standardized protocols. The optional BSI 10 plug in circuit board constitutes the
hardware interface. This may be configured as RS 232 C or RS 485 interface. The RS 485
interface permits networking several analyzers. Each analyzer may then be addressed using
an assignment numerical ID -code.
Communication is always initiated by the host computer; i.e., analyzer behave passively until
the host computer requests information from them or demands commencement of an action.
Communications use so - called “telegrams” being exchanged between the host computer and
the analyzer(s). Syntax for these telegrams is established in protocols.
Telegrams always commence with the "$" start character, immediately followed by a three - digit
instruction code.
Subsequent elements of telegrams are segregated by the ";" hyphen character.
The final element of all telegrams transmitted must be the “CR” termination character.
Upon receipt of the terminate character, the analyzer attempts to evaluate the current contents
of its input buffer as a valid telegram. If the syntax of the transmitted telegram is correct, the
analyzer will transmit a response telegram to the host computer. This consists of the start
character, an instruction code, requested data, a block - parity byte, and the termination character.
If the syntax of the transmitted telegram was not correct, the analyzer will transmit a status telegram
containing an error message to the host computer. Each terminate character reception thus
initiates an analyzer response.
GENERAL