SS100-SiS-R Device-mountable RS-232 to RS-485/422 converter, Terminal Block, 3kV isolation on RS-232


Key Features

  • Maximum Communication Speed: 500Kbps
  • ESD Protection (IEC 61000-4-2: ESD level 3 protection)
  • External power not required (When RTS/DTR signal line is enabled)
  • Compact size & 3kV isolation
  • Hardware-based Auto Toggling
  • RS422/RS485 mode selectable by external switch
  • LED port power indicator
  • Operating temperature ranges from -40~85˚C


The ATOP SS100/SS100SiS media converters provide complete signal conversion between RS-232 and RS-422/485, without requiring an external power source. It is a fast and efficient solution to overcome distance limitations of RS232 or for connecting to industrial devices with an RS422/RS485 interface. The converters support both half-duplex 2-wire RS-485 and full-duplex 4-wire RS-422/485, and you could select mode via DIP switch without extra software required. Automatic data direction control is provided for RS-485. In this case, the RS-485 driver is enabled automatically when the circuitry senses the TxD output from the RS-232 signal. This means that no programming effort is required to control the transmission direction of the RS-485 signal.

The RS-232 port of the ATOP SS100/SS100SiS is a DB9 female socket that can connect directly to the host PC, using the RTS/DTR lines to receive the power needed to run. Regardless of whether the signal is high, the can obtain enough power from the data line. The ATOP SS100-SiS, the version with isolation, still requires an external power supply. When there are many devices connected to RS422 or RS485 signal lines, we recommend that external power supply is necessary.