RS-485 -> RS-232
Converter for
PTZ Connection

Auto RTS Control (Auto Toggling)
Under 1:N communication environment, it is undesirable that multiple devices send data at once, causing electrical collision that leads to an error. In order to prevent this, only one device needs to send data at a time, which means that data I/O control is necessary at certain points. DVA CONVERTER performs automatic toggling by hardware, saving extra programming work.

RS422 Mode Wire Connection Example          RS485 Mode Wire Connection Example

What is RS485 Echo Mode?
The point which is different from the method for RS485 Non-echo mode is that the output signal line by itself is input again to the input signal line. Therefore, it is possible to confirm whether the data sent crashes with the data sent by another terminal or not by reading the echoed data. This operating mode is scarcely used except in some special purposes. On DVA CONVERTER all operation is controlled by hardware circuit so no operation is required by application program.


DVA CONVERTER converts RS232 signals to RS422 or 485. It is an efficient solution for applying advantages of RS422/485 to legacy RS232 devices. The converter operates with no extra software installation. With simple DIP switch toggling, RS422 or RS485 can be selected. Also, the product is fully compatible with serial COM port in PC.


  • Fully compatible with PC serial COM ports
  • Basically operates with no power (Power applied to DTR signal)
  • Enables the use of external DC power supply (7~12V) Built in Surge Protector
  • Auto Toggling by hardware (CS-428/9AT model only)
  • Communication status can be monitored through LEDs
  • DIP Swatch for RS422/485 mode
  • Max. 10 Device Connectivity for RS422 Multi-Drop Mode
  • Max. 32 Device connectivity for RS485 Mode


Mode Asynchronous serial communication
Speed Up to 921.6Kbps
Distance Max. 1.2Km @115.2Kbps,24AWG twisted pair cable
Connector RS232 : DB9 Female (Male : optional)
RS422/485 : Terminal Block 5P
Signals TXD, RXD, RTS, CTS, GND for RS232
Protection 3KV Isolation among sides
15KV Surge Protection for all signals
Data Bits 5, 6, 7, 8
Stop Bits 1, 1.5, 2
Parity None, Even, Odd, Space, Mark
RS422 mode Point-to-Point, Multi-Drop
RS485 mode Echo, Non-Echo
RTS Control RS422/485 mode switch
OS No Software Required
Power Input 7~12VDC
Power Consumption 0.4W (33mA@12V)
LED Power, TX, RX
Dimensions 74(W)x37(H)x19(D)mm
Weight 33g
Enclosure Plastic (Blue Color)
Operating Temp 0 ~ 55°C (32~131°F)
Storage Temp -20~70°C (-4~158°F)
Humidity 5 ~ 95% Non-Condensing
Approvals CE Class A, FCC Class A, RoHS Compliant