Gossen R2600 User Manual

GOSSEN METRAWATT GMBH

14

2.5 Criteria for the validity of a request telegram

The R2600/01 checks the characters of the telegrams received in accordance with the following tables:

If incorrect values are received for FF, PI and PS, the R2600/01 responds with a short set with set transmission error bit. If the user data is entered 
beyond its specific value ranges, the R2600/01 responds with a short set with set service request bit. The bit "impermissible value" is set in the error 
status word 2. 
If there are other deviations or a parity error, the telegram is invalid, the R2600/01 does not respond.

For short set:

For control and long set:

Character No.

Criterion

Character No.

Criterion

1

10h

1

68h

2

Interface address Addr or 255 (see 2.4.2)

2

Note length for PS and end character

3

FF = valid function coding

3

Character 3 = character 2

4

PS = Addr or 255 + FF

4

68h

5

16h

5

Interface address Addr or 255

6

FF = 69h oder 89h

7

PI = valid parameter index 

(see section 4)

. . .

(data block)

Length + 5

PS = 

1)

1) Bytewise sum without overflow over all characters from equipment address (Addr or 255) to checksum exclusive

Length + 6

16h