Toshiba VF-FS1 Using the RS485, Setting the communication functions, Transmission specifications

E6581381

6.21.2 Using the RS485

■Setting the communication functions

Setting commands and frequencies by communications has priority over sending commands from the operation panel or the terminal board. Command/frequency setting by communications can therefore be enabled, irrespective of the setting in the command mode (EOQF) or the frequency setting mode (HOQF). When inverters are connected to each others, however, in order for slave inverters to recognize frequency signals from the master inverter as frequency commands, the frequency setting mode selection 1 parameter (HOQF) provided for each slave inverter needs to be set to 4 (serial communications). Refer to the COMMUNICATIONS EQUIPMENT USER'S MANUAL for details.

However, when the input terminal function selection parameter is set to 48: SC/LC (Serial/Local selection), the inverter can be operated with the settings of the command mode (EOQF) or the frequency setting mode (HOQF) by external input.

■Transmission specifications

Item	Specifications
Transmission scheme	2-wire, Half-duplex
Connection scheme	Centralized control
Synchronization scheme	Asynchronous
		6
Transmission rate	Default: 19200 baud (parameter setting)
	Option: Either 9600 or 19200 baud
Character transmission	ASCII code: JIS X 0201 8, 8-bit (fixed)
	Binary code: Binary, 8-bit (fixed)
Stop bit length	Inverter receiving: 1 bit, Inverter sending: 2 bits
Error detection	Parity: Even, Odd, or None selectable by parameter setting;
	check sum method
Character transmission format	Receiving: 11-bit, Sending: 12-bit
Order of bit transmission	Least significant bit first
Frame length	Variable to a maximum of 17 bytes

■Example of connection for RS485-communication

<Example of connection>

Host computer

Option

VF-FS1

VF-FS1

VF-FS1

VF-FS1

F-81