8-1
Communications Specifications
The 3G3M1 Series Inverter has the RS-485-compliant Modbus communication function as standard,
which enables communications with external network controllers. The basic specifications of this com-
munications function are provided in the table below.
Item Description Remarks
Protocol Modbus communication (Slave)
Transmission speed
2,400, 4,800, 9,600, 19.2 k, 38.4 k, 57.6 k, 76.8 k, 115.2
kbps
Selectable via parame-
ter
Synchronous system Start-stop synchronous system
Transmission code Binary
Transmission mode LSB first (Transmission starts with Least Significant Bit)
Compatible interface RS-485
Data bit length 8 bits
Parity No/Even/Odd
Selectable via parame-
ter
Stop bit length 1 or 2 bits
Selectable via parame-
ter
Startup method One-side start by host command -
Wait time Silent interval 0.00 to 1.00 [s]
Selectable via parame-
ter
Connection form
1: N (N = 247 max.)
(32 units max. connectable without repeaters)
Selectable via parame-
ter
Error check Overrun/Framing/CRC-16/Horizontal parity
Communications cable
length
500 m
8 Communications Functions
8-3
M1 Series Standard Type User's Manual (I669)
8-1 Communications Specifications
8
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