IND690 communication protocol

Protocol specification
Communication line
I/O tag configuration
Document revisions

Protocol specification


This protocol is primarily intended for the configuration and acquisition of data from the weighing terminal Mettler Toledo IND690. The communication with the device is based on sending the requests for writing and reading of the application blocks. They are uniquely identified by their address, resp. the subaddress. You can find a more detailed description in the reference book of the respective device.

Communication line


As the device contains an RS-232 interface, it can communicate with the D2000 KOM process through two types of communication lines. The first way is to connect the device directly with the "Serial" line, or to use a converter. It converts data from RS-232 to UDP stream, which is processed by the "SerialOverUDP Device Redundant" line.

I/O tag configuration


These I/O tags can be used: Ai, Ao, Ci, Co, Di, Dout, TxtI, TxtO, TiA, ToA

I/O tag address consists of three basic parts:

  1. Command - enables choosing a command that the D2000 KOM process will send to the device. For an application which uses this protocol, we implemented two commands - "Read application block" and "Write application block".
  2. Address - defines the particular number of the application block.
  3. Element - defines an element, which is stored in the memory of application block.

As an example, we can use the application block No. 323. It contains the following elements:


It means, that 15 I/O tags must be created for this application block. I.e. 14 I/O tags for the individual values of application block, numbered from 1..14 and one "root" I/O tag of value 0, which is used as follows:


Document revisions


Communication protocols