Bronkhorst Modbus slave interface Bedienungsanleitung PDF herunterladen (Seite 18)

BRONKHORST®

4.4.4 Diagnostics (08)

The following sub-functions are supported

Sub-function code (dec)

Name

Return Query Data

Clear Counters and Diagnostics Register

Return Bus Message Count

Return Bus Communication Error Count

Return Bus Exception Error Count

Return Slave Message Count

Return Slave No Response Count

Return Slave NAK Count (always 0)

Return Slave Busy Count (always 0)

Return Bus Character Overrun Count

Warning: the maximum message size for the Return Query Data sub function is 100 bytes at 9600 baud

(200 bytes at 19200 baud and 400 bytes at 38400 baud). When this size is exceeded, corrupted

responses may be received.

Possible exception responses

Code

Name

Meaning

ILLEGAL FUNCTION

of not-supported sub-function

ILLEGAL DATA VALUE

in case of an incorrect value for the data field

SLAVE DEVICE FAILURE

in case of writing illegal value to register

4.4.5 Report Slave ID (17)

The Slave ID field in the response is a string with the same contents as FlowDDE parameter 1 (ident number + version

nr/serial nr). The Run Indicator Status field in this message will indicate ON when the device is in normal operating

mode (FB_NORMAL).

Possible exception responses

Code

Name

Meaning

SLAVE DEVICE FAILURE

in case of an internal error

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