Schweitzer Engineering SEL-2032 - Figure 3.24 Received Message; Figure 3.25 Response Message

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3.28

SEL-2032 Communications Processor Instruction Manual Date Code 20120126

Job Done Examples

Example 6: Modbus Job Done

Step 7. View the data stored in the Port 2 METER data region by

issuing the commands VIEW 2:METER or VIEW 2:D1. The

SEL-2032 responds with a data “dump” showing the data

stored in the region at the time of the request with the

respective data item labels. In this example, the data are

updated once each second.

Step 8. Cause the Modbus master to send a “read PORT 2 METER

region” message. In the message, the slave address field is the

Port 2 address set in Step 3. The Register Address field is

METER (100). The Register Count is the meter data length for

SEL-321-1. (use the MODMAP command to display the

data displayed by the VIEW command if the data have not

been updated since issuing the VIEW command. The

following shows a typical exchange:

Figure 3.24 Received Message

Figure 3.25 Response Message

06 to address 6

function code 4

starting register address 100

read 96 registers

CRC-16 code

06 from address 6

192 bytes of data following

successful function code 4 response

•

first register

second register

last two registers

(IEEE float)

CRC-16 code

Courtesy of NationalSwitchgear.com