Gossen R2600 User Manual download pdf (Page 14)

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

Length + 6 16h

1 2 ... 9 10 11 12 13 14 15 16 17 18 19 ... 39 40

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Gossen R2600 User Manual Page 14

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