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[6] RS-485
1. RS-485
RS-485 is an interface standard which enables multi-point communication, established by the Electronic Industrial
Association (EIA) in the USA.
The familiar RS-232C is also an EIA standard. Compared with RS-232, RS-485 features multi-point com-
munication: long distance, (*) high speed transmission with balanced electrical transmission capabilities.
* Long distance transmission (up to several hundred meters) is possible equally at either transmission speed
(38400 or 9600 BAUD).
However, cable quality or other factors may cause problems with long distance data transmission.
Avoid using unnecessarily long cable if the devices are close to each other, and use a reliable cable if long
distance transmission is required.
«RS-485 enables bus configuration
Bus configuration enables communication among multiple devices.
00
roma resistor
22 |
/
^,
Terminating resistor —
x
RS-485 standards are the electrical characteristics for high speed communication. It may not be possible to
communicate between all the devices provided with RS-485. Communication is only possible when all devices
are provided with the appropriate communication software, and are set to the correct format (Protocol.
It is possible to communicate with other DEQS(E)s through the RS-485 provided with this unit, but it is not
possible to communicate control data to devices with other transmission formats.
However, devices other than the DEQS(E) (a personal computer or equivalent device) which have started up
software for controlling the DEQS through its RS-485 do not apply. (*)
* Please use an RS-232C or RS-422 > RS-485 conversion box to connect the DEQS(E) to devices only
equipped with a RS-232C or RS-422 terminal. (a personal computer for example)
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