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NOVUS AUTOMATION 14/14

ANEXO 2 –SERIAL COMMUNICATION

The controller can be supplied with an asynchronous RS-485 digital

communication interface for master-slave connection to a host

computer (master). The controller works as a slave only and all

commands are started by the computer which sends a request to the

slave address. The addressed unit sends back the requested reply.

Broadcast commands (addressed to all indicator units in a multidrop

network) are accepted but no reply is sent back in this case.

CHARACTERISTICS

• Signals compatible with RS-485 standard. MODBUS (RTU)

Protocol. Two wire connection between 1 master and up to 31

(addressing up to 247 possible) instruments in bus topology. The

communication signals are electrically insulated from the rest of the

device;

• Maximum connection distance: 1000 meters.

• Time of disconnection for the controller: Maximum 2 ms after last

byte.

• Selectable speed; 8 data bits; 1 stop bit; selectable parity (no parity,

pair or odd);

• Time at the beginning of response transmission: maximum 100 ms

after receiving the command.

The RS-485 signals are:

D +

Bi-directional data line.

Terminal 16

D -

Bi-directional inverted data line.

Terminal 17

Optional connection that

improves the performance of the

communication.

Terminal

GND

CONFIGURATION OF PARAMETERS FOR SERIAL

COMMUNICATION

Two parameters must be configured for using the serial type:

bavd

: Communication speed.

prty

: Parity of the communication.

addr

: Communication address for the controller.

REDUCED REGISTERS TABLE FOR SERIAL

COMMUNICATION

COMMUNICATION PROTOCOL

The MOSBUS RTU slave is implemented. All configurable

parameters can be accessed for reading or writing through the

communication port. Broadcast commands are supported as well

(address 0).

The available Modbus commands are:

03 - Read Holding Register

06 - Preset Single Register

05 - Force Single Coil 16 - Preset Multiple Register

HOLDING REGISTERS TABLE

Follows a description of the usual communication registers. For full

documentation download the Registers Table for Serial

Communication in the N120 section of our web site.

Address

Parameter

0000 Active SP Read: Active control SP (main SP, from

ramp and soak or from remote SP).

Write: to main SP.

Range: from

spll

spkl

0001 PV Read: Process Variable.

Write: Not allowed.

Range: Minimum value is the one

configured in

spll

and the maximum

value is the one configured in

spkl

Decimal point position depends on

dppo

value.

In case of temperature reading, the value

read is always multiplied by 10,

independently of

dppo

value.

0002 MV

Read: Output Power in automatic or

manual mode.

Write: Not allowed. See address 28.

Range: 0 to 1000 (0.0 to 100.0 %).

1 2 ... 9 10 11 12 13 14

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