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Chapter 8
– RS485 Communication
8-2
8.2 Specification
8.2.1
Performance specification
Item
Specification
Transmission form
Bus method, Multi-drop Link System
Applicable inverter
SV-iP5A series
Connectable drives
Max. 31
Transmission distance Max. 1,200m (Within 700m Recommended)
Recommended wire
0.75mm
2
(12AWG), Shielded Twisted-Pare Wire
8.2.2
Hardware
specification
Item
Specification
Installation
Use C+, C-,CM terminals on control terminal block
Power supply
Use Insulated power from the inverter power supply
8.2.3
Communication specification
Item
Specification
Communication speed
19,200/9,600/4,800/2,400/1,200 bps selectable
Communication system
Half duplex system
Character system
ASCII (8 bit)
Stop bit length
1 bit
Sum check (CRC16)
2 bytes
Parity bit
None
Protocol supported
Parameter Read/Write, Monitoring parameter
register/execution Broadcasting
8.2.4
Installation
▣
Connecting the communication line
1)
Connect the RS485 communication line to the inverter’s (C+), (C-) and CM
terminals of the control terminals.
2) Connect the CM terminal among inverters for stable communication.
3) Check the connection and turn ON the inverter.
4) If the communication line is connected correctly set the communication-related
parameters as the following.
5) Install a repeater to upgrade the communication speed or longer than 1200mm
communication line is used.
Repeater is required for upgrading communication quality in the noise-high
environment.
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