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Small rectangular converter unit with DB9 female and male connectors, compact grey finish

Bluecctv

Bluecctv STM485S RS232 to RS485 PTZ converter surveillance accessory

SKU CH-T0DE-VG4E5

Converts RS232 signals to RS485 for PTZ control over distances up to 1200m at rates from 300 to 115200bps

  • Converts RS232 signals to RS485 for extended PTZ control
  • Half-duplex differential transmission at 300 to 115200bps
  • RS485 side reaches up to 1200m transmission distance
  • DB9 male connector with included terminal board for flexible wiring
  • Operates reliably from 0 to 70°C and 5% to 95% humidity

RS232 to RS485 PTZ converter

The Bluecctv STM485S converts RS232 signals to RS485 for pan-tilt-zoom camera control. It uses a DB9 female connector on the RS232 side and a DB9 male connector with an included terminal board on the RS485 side. The unit operates in asynchronous half-duplex differential mode at rates from 300 to 115200bps.

Installers needing long cable runs

This converter suits installers who must run PTZ control signals over distances up to 1200 metres on the RS485 side while keeping the RS232 link within five metres. It is not for setups that require full-duplex communication or purely RS232 cabling throughout.

Check connector gender and voltage range

Verify that your controller provides a DB9 male port to mate with the converter's DB9 female RS232 input. Confirm the PTZ device accepts a DB9 female connection or terminal-block wiring on the RS485 side. Ensure the operating temperature range of 0 to 70°C and humidity tolerance of 5% to 95% match the installation environment.

How it compares

Measured against everything we stock in Camera Mounts & Add-Ons, at today’s prices. Recalculated every night.

Price $20.99
Cheaper than about 58% of the 1,144 comparable items (median $24.99).

Specifications

Product
Brand nameBluecctv
Model nameSTM485S

Questions about this item

What type of RS-232 port must my DVR or controller provide to plug the DB9 female connector on this converter?

Your DVR or controller needs a standard DB9 male RS-232 port; the converter's DB9 female connector mates directly with it.

If I keep an existing PTZ camera that uses screw-terminal RS-485 wiring, can I connect it without soldering?

Yes, the included terminal board attaches to the converter's DB9 male RS-485 side, giving you screw terminals for the camera's existing wiring.

After wiring everything, how can I confirm the converter is passing PTZ commands at the correct 115200 bps rate?

Send a pan or tilt command from the controller; if the camera responds smoothly without garbled movement, the link is operating at the configured baud rate.

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