Connection With Equipment - Toshiba RS4002Z-0 Instruction Manual

4.

Connection with equipment

Connect the RS485 converter unit with inverters as follows:
(1) Turn off input power of the inverter and wait at least ten minutes and check to make sure that the
charge lamp is no longer lit.
(2) Set the communication speed, bit length and wiring method (4-wire or 2-wire) using the switches
of the RS485 converter unit. Furthermore, when communicating in the binary mode, the inverters
conforming to 2-wire system (G command function is provided) can only be communicated in 2-
wire system. When using the binary method but without the 2-wire system function, use 4-wire
system.
Use the same communication speed, bit length and wiring method for RS485 converter units that
are connected in the same network. (Refer to page 6.)
(3) Connect terminating resistor in both ends of units. The RS485 Option Unit has internal
terminating resistor. Set SW2-3 and SW2-4 to ON to connect these terminating resistors.
(Refer to page 6.)
(4) Install the RS485 Option Unit on a metal panel. (Refer to page 8.)
(5) Connect the RS485 communication cable to the removable terminal block. (Refer to page 9 and
page 10.).
Be sure not to short any wires.
(6) Connect the shield of the twisted pair cable to the SHIELD terminal on each RS485 Option Unit,
and make the ground connection. Do not connect the shield of the twisted pair cable to a power
ground or any other noise-producing ground connection
(7) Insert the removable terminal block back into the RS485 Option Unit.
(8) Connect the communication connectors (CN1 to 8) of the RS485 Option
Unit to the inverter's common serial option (communication) connector of the with the optional
cable.
(9) Turn on the power of the inverter
(10) Set the communication parameters of the inverter. (Refer to page 12.)
(11) Turn off the power of the inverter and then turn it on again if the parameters have been changed.
* Transmission/Reception is automatically changed in the RS485 converter unit.
This unit can be used only in semi-duplex transmission.
* Observe the following when data is transmitted from PC to the inverter.
To prevent a possible error due to the difference of communication speed between the equipment,
provide a time interval for one bit data length or more from the time data is received before starting
data to the inverter.
Time for one bit data = 1 ÷ communication speed
(Example) in the case of 19200bps: 1 ÷ 19200 = 52µs
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