Laurel Electronics LTE SERIES TRANSMITTERS PULSE INPUT User Manual

Page 30

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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.

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