BENSHAW RSi H2 Series - Communication Features; Communication Standards

Communications
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10 RS-485 Communication Features
This section explains how to control the inverter with a PLC or a computer over a long distance
using the RS-485 communication features. Connect the communication cables and set the
communication parameters in the inverter. Refer to the communication protocols and parameters
to configure and use the RS-485 communication features.
10.1 Communication Standards
Following the RS-485 communication standards, H2 products exchange data with a PLC and
computer. The RS-485 communication standards support the Multi-drop Link System and offer an
interface that is strongly resistant to noise. Please refer to the following table for details about the
communication standards.
Item
Standard
Communication method/
Transmission type
RS-485/Bus type, Multi-drop Link System
Inverter type name
H2
Number of connected
inverters/ Transmission
distance
Maximum of 16 inverters / Maximum1,200 m (recommended
distance: within 700 m)
Recommended cable size
0.75 mm², (18 AWG), Shielded Type Twisted-Pair (STP) Wire
Installation type
Dedicated terminals (S+/S-/SG) on the control terminal block
Power supply
Supplied by the inverter - isolated power source from the
inverter’s internal circuit
Communication speed
1,200/2,400/4800/9,600/19,200/38,400/57,600/115,200 bps
BACNET: 9600/19200/38400/76800 bps
Control procedure
Asynchronous communications system
Communication system
Half duplex system
Character system
Modbus-RTU: Binary
Stop bit length
1-bit/2-bit
Frame error check
2 bytes
Parity check
None/Even/Odd