Watlow CLS200, MLS300 and CAS200 User Manual download pdf (Page 35)

Chapter 2: Modbus-RTU Protocol

Communications Speciﬁcation 29

operation, or power-up.

Subfunction Data Field (Query) Data Field (Response)

x00 0C x00 00 CRC Error Count

x0D Return Bus Exception Error Count

• The response data ﬁeld returns the quantity of Modbus-RTU

exception responses returned by the slave since its last

restart, clear counters operation, or power-up.

Subfunction Data Field (Query) Data Field (Response)

x00 0D x00 00 Exception Error

Count

x0E Return Slave Message Count

• The response data ﬁeld returns the quantity of messages

addressed to the slave, or broadcast, that the slave has pro-

cessed since its last restart, clear counters operation, or

power-up.

Subfunction Data Field (Query) Data Field (Response)

x00 0E x00 00 Slave Message Count

x0F Return Slave No Response Count

• The response data ﬁeld returns the quantity of messages

addressed to the slave for which it returned a no response

(neither a normal response nor an exception response),

since its last restart, clear counters operation, or power-up.

Subfunction Data Field (Query) Data Field (Response)

x00 0F x00 00 Slave No Response

Count

x0F Force Multiple Coils

• Forces each coil (registers 00001 to 09999, the coils) in a sequence

of coils to either ON or OFF. When broadcast, the function forces

the same coil references in all attached slaves.

x10 Preset Multiple registers

• Presets values into the sequence of holding registers (registers 40001

to 49999). When broadcast, the function presets the same register

references an all attached slaves.

NOTE

The function will override the controller’s memory protect

state. The preset values will remain valid in the registers

until the controller’s logic next solves the register contents.

The register values will remain if they are not programmed

in the controller’s logic.

1 2 ... 30 31 32 33 34 35 36 37 38 39 40 ... 91 92

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Watlow CLS200, MLS300 and CAS200 User Manual Page 35