ComAp InteliGen NTC BaseBox User Manual

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IGS-NT Communication Guide

Modbus/TCP access code

Every Modbus/TCP session has to be started with writing the access code from the modbus/tcp client to the

controller. If the session is closed and reopened again the access code must be written again. The session can

be closed by the client or the controller closes the session automatically if there is no activity from the client

side for 15s.

There are new dedicated registers for entering the AccessCode via Modbus/TCP.

The register numbers are 46339-46346 (register address 6338-6345).

The previous method using register address 24535 remains working as well.

Example of the Modbus message is following (in HEX):

01 10 18 C2 00 08 10 30 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 FE F3

01 Controller address

10 Modbus function (16dec – Write multiple registers)

18C2 Register address (18C2hex = 6338dec = register 46339)

0008 Number of registers

10 Length of the data (Number of registers x 2B)

30000000... Access code string (16 chars, null-terminated, ASCII, here “0”)

FEF3 CRC

Some devices do not support the modbus function 16. In this case can be the access code writen in controller

as one register No. 46339 using the function 6. The access code has to be the number in the range 0 to 65535.

Equipment

Equipment needed

Controllerside -

Connection

Ethernet cable (page 85) to LAN, for point to point connection between PC and

controller use cross-wired cable

PC side ETHERNET connection

For more informations about ModBus implementation to ComAp controllers see Modbus Communication on

page 90.

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ComAp InteliGen NTC BaseBox Specifications

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