Laurel-electronics LTM CTR SERIES PULSE, AC or PROCESS TOTALIZER INPU User Manual download pdf (Page 30)

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FC08: Diagnostics

Checks communications between the Master and Slave, and returns the count in the Modbus

Slave counters (which are reset when the meter is reset).

Hex Sub

Function

Code

Data

Send

Response

Data

Description

00 00 Any Same

as sent

Returns Query Data (N x 2 bytes). Echo Request.

00 01

FF 00

00 00

FF 00

00 00

Restarts Communications. If in the Listen-Only mode, no

response occurs. Takes Slave out of the Listen-Only mode

and one of the following:

Clears communications event counters.

Does not clear communications event counters.

00 04 00 00 None Forces Listen-Only. All addressed and broadcast

Messages are monitored and counters are incremented,

but no action is taken or response sent. Only Sub-

Function 00 01 causes removal of this Listen-Only state.

00 0A 00 00 00 00 Clears all Modbus slave counters.

00 0B 00 00 Total

Message

Count

Returns total number of messages detected on the bus,

including those not addressed to this Slave. Excludes bad

LRC/CRC, parity error or length < 3.

00 0C 00 00 Checksum

Error

Count

Returns total number of messages with bad LRC/ CRC,

parity or length < 3 errors detected on the bus including

those not addressed to the Slave.

00 0D 00 00 Exception

Error

Count

Returns total number of Exception responses returned by

the Addressed Slave or that would have been returned if

not a broadcast message or if the Slave was not in a

Listen-Only mode.

00 0E 00 00 Slave

Message

Count

Returns total number of messages, either broadcast or

addressed to the Slave. Excludes bad LRC/CRC, parity or

length < 3 errors.

00 0F 00 00 No

Response

Count

Returns total number of messages, either broadcast or

addressed to the Slave, for which Slave has returned No

Response, neither a normal response nor an exception

response. Excludes bad LRC/CRC, parity or length < 3

errors.

00 11 00 00 Slave

Busy

Returns total number of Exception Code 6 (Slave Busy)

responses.

1 2 ... 25 26 27 28 29 30 31 32 33 34 35 ... 39 40

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