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SERIAL INTERFACE (OPTION)
12 - 10
ETC00781(4) Series 100 e 02/2004
12.4.6 Numerical Representations
Telegrams may contain integers or real numbers. The formats for these numbers are subject to
the following restrictions.
Integers: - maximum value = 2
16
- 1
- positive numbers only accepted
- no decimal points allowed
Real: - maximum of 6 digits accepted
- no alphabetic characters (e.g. 2.2E-6) allowed
- analyzer output is 6 - digit real numbers
12.4.7 Block Parity Check
The master control computer may insert a message length parity byte into telegrams. These
invariably consist of two characters.
The message - length parity byte is the cumulatively EXCLUSIVE - OR correlation of all previously
transmitted characters of the telegram line. Representation is in hexadecimal format. For example,
if the decimal value should be decimal 13, this will be represented by the two characters “OD”, i.e.,
030H and 044H.
The verification procedure may be enabled or disabled at the analyzer (see chapter 12.3.4).
NUMERICAL REPRESENTATION / BLOCK PARITY CHECK