DCP200 Profile Controller & Recorder - Product Manual

12 Serial Communications

Supported Protocols

Communication with a Modbus RTU or Modbus TCP master device is possible if the appropriate communications module is fitted into Option Slot A. An RS485 Module is required for Modbus RTU. An Ethernet Module is required for Modbus TCP.

The instrument can also act as Setpoint Master over RS485 in multi-zone applications. In this mode the unit continuously sends its setpoint value using Modbus broadcast messages.

For a complete description of the Modbus protocol refer to the description provided at http://www.modbus.org/

All models also have a configuration socket for use with the PC configuration software. An RS232 to TTL lead (available from your supplier) is required in order to use this socket.

A front mounted USB port is available on some models; this can also be used to configure the instrument or to transfer recorder or profile files via a USB memory stick.

RS485 Configuration

The RS485 address, bit rate and character format are configured via the front panel from the Comms Configuration menu or by using the PC Configurator software.

Physical layer configuration settings possible are:

Data rate:

4800, 9600, 19200, 38400, 57600 or 115200 bps

Parity:

None (default), Even, Odd

Character format:

Always 8 bits per character.

Device Address:

See below.

RS485 Device Addressing

The instrument must be assigned a unique device address in the range 1 to 255. This address is used to recognise Modbus Queries intended for this instrument. With the exception of globally addressed broadcast messages, the instrument ignores Modbus Queries that do not match the address that has been assigned to it.

The instrument will accept broadcast messages (global queries) using device address 0 no matter what device address is assigned. No response messages are returned for globally addressed Queries.

Ethernet Configuration

For Modbus TCP communications (Modbus over Ethernet), the IP address can either be assigned by a Dynamic Host Configuration Protocol (DHCP), BootP or AutoIP server on the network, or manually assigned using the IP address allocation software tool.

Refer to the PC Software section of this manual for more information setting IP addresses. The supported data rates 10/100BASE-T (10 or 100 Mbps) are automatically detected.

Page 78

Serial Communications

51-52-25-150, Issue 1 – April 2009

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Honeywell DCP200 manual Serial Communications, Supported Protocols, RS485 Configuration, Ethernet Configuration

DCP200 specifications

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