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SERIAL INTERFACE (OPTION)
12 - 8
ETC00781(1) Series 100 e 10/2001
Rosemount Analytical
12.4 Telegram Syntax
Telegrams are assembled as follows:
12.4.1 Start Character ( “$” = Hex 24)
If the start character is missing, this will result in transmission of an appropriate status telegram
by the analyzer.
12.4.2 Terminate Character ( “CR” = Hex OD)
If the terminate character is missing, no decoding of the transmitted information will be performed,
and the analyzer will not respond. No response message will be transmitted.
12.4.3 Instruction Code
Each instruction is assigned a unique three digit numerical instruction code. If a received
instruction code should be other than three digits in length or contain non-numerical ASCII-
characters, the analyzer will transmit an appropriate status telegram. Reception of unassigned
instruction codes will also result in the transmittal of a status telegram.
In the RS 232 C mode of operation, the instruction code immediately follows the start character;
in the RS 485 mode of operation, the start character is followed by a two digit device identification
code, the separator character “;”, and a three digit instruction code, in this order.
12.4.4 Hyphen Character ( “;” = Hex 3B)
Individual elements of a telegram line are separated by this hyphen character. Missing hyphen
characters can lead to misinterpretations of telegrams, and will result in transmission of an
appropriate status telegram.
TELEGRAM SYNTAX