-100-
v6.3
Industrial Protocols
19.2. RS-485 / Modbus module
Technical details:
•
Protocols:
RS-485 and Modbus
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Standard:
EIA RS-485
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Physical Media:
Twisted pair
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Connector:
DB9
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Network Topology:
Point-to-point, Multi-dropped, Multi-point
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Maximum Devices:
32 drivers or receivers
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Mode of Operation:
Differential signaling
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Maximum Speed:
460800 bps
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Voltage Levels:
-7 V to +12 V
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Mark(1):
Positive Voltages (B-A > +200 mV)
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Space(0):
Negative voltages (B-A < -200 mV)
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Available Signals:
Tx+/Rx+, Tx-/Rx-(Half Duplex)Tx+,Tx-,Rx+,Rx-(Full Duplex)
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Available sockets in Waspmote:
socket 0 (special SPI Waspmote required)
Applications:
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Industrial Equipment
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Machine to Machine (M2M) communications
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Industrial Control Systems, including the most common versions of Modbus and Profibus
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Programmable logic controllers
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RS485 is also used in building automation
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Interconnect security control panels and devices
Figure: RS-485 / Modbus module