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RS-232 to RS-485 Carrier HVAC Converter - Automatic Send Data Control
  • Connect your laptop PC to Carrier branded HVAC equipment
  • Extend RS-232 data signals up to 1.2 km (4,000 ft.)
  • Change RS-232 TD and RD to RS-485 signals
  • Automatic Send Data Control - no software drivers necessary
  • Baud rates up to 115.2 kbps
  • Powered from RS-232 handshake lines - no power supply required
Model 485CARLP9A is an RS-232 to RS-485 converter that allows you to connect your laptop PC to Carrier branded HVAC equipment. Model 485CARLP9A is a port-powered, half-duplex RS-232 to RS-485 converter with send data control. The unit converts TD and RD RS-232 lines to balanced RS-485 signals and supports three-wire (Data A, B, and Signal Ground reference) RS-485 communications only. The converter is powered from the RS-232 handshake lines, RTS, CTS and DTR, DSR, CD. The handshake lines are looped back on each other and can be in either state. No handshake change is necessary – no software is required to control the lines. The RS-485 driver is enabled with each bit of data. The RS-485 receiver is disabled when the driver is enabled and enabled when the driver is disabled. This prevents data from being echoed back into the RS-232 device. The RS-232 side has a DB-9 female connector. The RS-485 side has a six-position RJ11 connector. Note:  Some names and words are trademarks of their respective owners. Carrier is a part of UTC Climate, Controls & Security, a unit of United Technologies Corporation ("UTC").

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