Limaco ULM-3D Series, Руководство по эксплуатации и установке

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Fig. 6.5 "Star" method of laying RS-485 line
The low transmission rate of 9,600 bps used in the level transmitter ensures good
noise immunity of the communication line and allows using various options for lay-
ing cables, including "star" method, Fig. 6.5. The user chooses the appropriate op-
tion for the convenience of laying cables and minimizing their length. There is
usually no need to install matching resistors for a line like this.
Few communication errors may occur on long and branched lines. Such communi-
cation errors do not result in unreliable data about the level, since the Modbus ex-
change protocol used in the level transmitter contains a control computation to de-
termine the unreliability of readings. Such data will be ignored.
6.3 Setting key parameters of level transmitter using PC via RS-485.
Minimum PC requirements: Pentium II, 256 MB RAM, 800x600 monitor, USB or
COM port, OS Windows 95 or higher.
CONFIGURATOR software (ULMCFG) is used to configure level transmitters.
The software helps:
- obtain and change key settings of level transmitters;
- diagnose the operation;
- upload the configuration from a file to the level transmitter;
- save on disk and view debug information (photos of signals);
- update level transmitter software;
- access the registers of level transmitter.
The program does not require installation, just copy the ULMCFG file.EXE to a
pre-created folder on your hard disk.
A detailed software description is given in "Configurator. User Manual".
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