Modbus Protocol; Pc To Id-Dcu Marine Controller Connection; Communication Object Vs. Register - ComAp InteliDrive DCU Marine Manual

Expandable engine controller
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Sensor characteristics modification
History record modification
Password level protection modification (password value must be changed in InteliMonitor)
Additional PLC logic creating
InteliVision displays screens modification
ECU Fault codes management
Controller firmware (mhx file) upgrade
Controller application file Up/Down load
Language translator enables (not available in version 1.0)
Create Dictionary between two languages (Dictionary can be used repeatedly)
Translate current text in Controller (in any language)
Add new language (up to controller memory limit)

PC to ID-DCU MARINE controller connection

Uploading or downloading procedure only (no continuous on-line connection)
Direct RS232 connection
Modem and internet connection

2.2.5 Modbus protocol

Direct connection: RS232, RS422, RS485
Modem connection
9600, 19200, 38400, 57600 or 115200 bps, 8 data bits, 1 stop bit, no parity
Transfer mode RTU
Function 3 (Read Multiply Registers)
Function 6 (Write Single Register)
Function 16 (Write Multiply Registers)
The response to an incoming message is sent with minimum 4.096 ms delay after message reception
The complete description of Modbus communication protocol can be found in Modbus Protocol Reference
Guide PI-MBUS-300 and Open Modbus Specification Release 1.0. Both documents are available from web site
at http://www.modicon.com/openmbus/.

Communication object vs. Register

All the data intended for communication has its representation as communication objects in the controller. The
communication object is represented by the n-byte array in the controller memory and identified by the unique
16-bit communication object number. The register, according to Modbus communication protocol, represents a
two-byte data and in communication functions is referenced by 16-bit register address. Further in the description
of communication functions the communication object number will always be used as a register address and
length of the communication object will be expressed by number of registers. Just one communication object
can be read or written by one communication function.
InteliDrive DCU Marine - 3.0.0 Global Guide
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