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Connecting the RS485 link

RS232 / RS485 interface

RS232-RS485
Function
  • If the PC is equipped with an RS232 port, this interface will convert RS232 signal into RS485.
  • Up to 31 devices can be connected to the interface over a distance of 1200 m at 9600 bauds.
diagram RS232 - RS485 interface
(1) Beyond these characteristics, use an ” RS422 / RS485 repeater”.
References
Auxiliary power supply US Frequency Reference
95 … 240 VAC / 110 … 250 VDC 50 Hz 4899 0100

 

USB / RS485 interface

Function
  • If the PC is not equipped ith a serial port, this interface can be connectedvia a USB p rt to obtain an RS485 communication port.
  • Recommended for local use and not for permanent installation.
diagram USB - RS485 interface
(1) Beyond these characteristics, use an ” RS422 / RS485 repeater”.
References
Description of accessories Reference
External USB / RS485 interface unit 4899 0110

RS422 / RS485 repeater

Function
  • In some applications the maximum distance and/or the maximum number of devices can be exceeded.
  • One solution to this technical restriction is to install an interface which amplifies the signal over a further 1200 m (at 9600 bauds) for 31 devices.
  • In addition, it allows you to introduce a new branch to the network thereby making it possible to reduce the length of connection cable required by avoiding back and forth cabling.
diagram RS422 - RS485 repeater
References
Auxiliary power supply US Frequency Reference
95 … 240 VAC / 110 … 250 VDC 50 Hz 4899 0120