ATI Q46 Profibus Communications Manual
8
O&M Manual
Rev-E (2/16)
1.6 The GSD File
The device GSD file is the key that allows all devices on a Profibus network to operate together.
This file is a simple ASCII text file that provides device specific information such as the
manufacturer name, the device name/ID, hardware/software version, baud rate capability, and
number of (or type of) I/O. The GSD file format must conform to Profibus Standard EN 50170.
The universal GSD file can be acquired directly from ATI. Please verify that the GSD file matches
the instrument and revision that you are using. The GSD file is uploaded to the network master
during the commissioning process to inform the master as to what information will be available
from the slave device.
The ATI GSD file for the Q46 instrument family is based on a modular format, so different
versions (pH, dissolved oxygen, conductivity, etc.) of Q46 instruments can be grouped together in
the same GSD file – greatly simplifying the commissioning process. All Q46 instruments provide
20 bytes of input data to the master, and the meaning of the bytes changes slightly depending on
which Q46 instrument is used.
1.7 Raw Data Structure
For parsing on the PLC, the details of the exact bytes for the Q46 are shown in tables in section
1.8. This section presents a closer look at that data on the network. To start, below is the
description on how the Q46H chlorine system data is structured. Bytes indexed 1-20 are simply
the first to last byte received – 20 total.
*Note- Long = Long Integer, requires 4 bytes. Char = Character, requires 1 byte
Figure 5 - Q46H GSD File Data Stucture, I/O Format Detail
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