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V2.05 subject to changes | Webdyn © by Flexitron Group
The RS485 standard imposes a differential level of at least 200 mV to detect the signal level. To do that,
the polarisation resistors must be at one end of the bus, usually at the master level. A simple method
to check the correct polarisation consists in positioning the polarisation source at the start of the bus
(master side) and to check the voltage level at the other end of the bus.
The common terminal (ground) must be interconnected with the corresponding terminals on each
appliance to make sure the voltage between them is balanced. If the common conductor is not
installed between all the devices, they must be properly grounded in compliance with the manufacturer
recommendations for each network device. This requirement implies the use of an extra wire which,
although not part of the communication process, is essential to guarantee the electric integrity of the
network devices.
For more information on the RS4875/RS422 standards and device wiring, refer to the EIA-485
and EIA RS-422-A standards.
2.4.7 Input/Output Interface
The WebdynSunPM is tted with:
• 4 analog inputs
• 3 digital inputs
• 1 relay output
2.4.7.1 Analog 0-10V or 4-20mA Inputs
The WebdynSunPM has 4 analog inputs marked “Analog” used to measure current of between 4 and 20
mA or a voltage of between 0 and 10 V. Each analog terminal block has a power output that can be used
to power a sensor. The voltage delivered by this power output is equal to the concentrator’s power supply
voltage. The earth on each analog terminal block is common.
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