Electro Industries Shark 200T Especificaciones descargar pdf (Pagina 177)

Doc# E149701 B - 17

B: Modbus Map and Retrieving Logs

Electro Industries/GaugeTech

The Leader In Power Monitoring and Smart Grid Solutions

Electro Industries/GaugeTech

The Leader In Power Monitoring and Smart Grid Solutions

# Points Hi 00

# Points Lo 7D

Repeat Count 04

Function Code 0x23 is a user defined Modbus function code, which has a format simi-

lar to Function Code 0x03, except for the inclusion of a "repeat count." The repeat

count (RC) is used to indicate that the same N registers should be read RC number of

times. (See the Number of Repeats bullet on page B-14.)

NOTES:

• By itself this feature would not provide any advantage, as the same data will be

returned RC times. However, when used with auto-incrementing, this function con-

denses up to 8 requests into 1 request, which decreases communication time, as

fewer transactions are being made.

• In the Shark® 200 meter repeat counts are limited to 8 times for Modbus RTU, and

4 times for Modbus ASCII.

The response for Function Code 0x23 is the same as for Function Code 0x03, with the

data blocks in sequence.

IMPORTANT! Before using function code 0x23, always check to see if the current

connection supports it. Some relay devices do not support user defined function

codes; if that is the case, the message will stall. Other devices don't support 8 repeat

counts.

B.5.4.3: Log Retrieval Procedure

The following procedure documents how to retrieve a single log from the oldest record

to the newest record, using the "normal" record type (see Scope). All logs are

retrieved using the same method. See Section B.5.4.4 for a Log Retrieval example.

NOTES:

• This example uses auto-increment.

• In this example, Function Code 0x23 is not used.

• You will find referenced topics in Section B.5.3. Block Definitions.

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Electro Industries Shark 200T Especificaciones Pagina 177