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Step 2: Using Jumpers to Set the Pins for RS-485 Installation

By default, the termination pins have three slave jumpers installed in the J6/Master

positions and three jumpers in the J7/Slave positions when the inverter is shipped. The

location of the jumpers can determine the following settings to an inverter:

• Terminate the network

• Set jumpers for the center inverter(s) on the network

• Turn on biasing

Jumper setting options

A. Terminate the network.

The performance of your Modbus network may require each end of the network

to be terminated using 120 ohm termination resistors. When the network is

long, relative to the RS-485 bit rate in use, bus terminations must be installed.

The network length is determined by the total backbone cable length, and not

necessarily the line-of-sight between the two furthest apart devises.

RS-485 / Modbus

Bit Rate

Maximum Network Length

without Termination

Feet (Meters)

Maximum Network Length

with Termination

Feet (Meters)

9600 bps 1000 (305) 4000 (1200)

19200 bps 500 (152) 4000 (1200)

38400 bps 250 (76) 4000 (1200)

57600 bps 150 (46) 4000 (1200)

Table 5-1 Maximum Network Length per Modbus Bit Rate

If bus termination is desired and the inverter is on the end of the Modbus

network, you may use the built-in bus termination resistors.

• To enable an inverter’s bus termination, place the J7 “Line” jumper on its

outboard pins. See Table 5-2 for the pin locations.

J6 J16 J7

High X

Line X

Low X

Table 5-2 Termination Enabled (for End Device)

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 128 129

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