Serial Converter A53-DB9F

- ADDC™ (Automatic Data Direction Control) RS-485 data control
- Automatic baudrate detection
- RS-422 hardware flow control: CTS, RTS signals
- LED indicators for power and signal status
- RS-485 multidrop operation, up to 32 nodes
- 2 kV isolation protection 
- Built-in 120-ohm termination resistors

Moxa A53 is a general purpose RS-232 to RS-422/485 converters designed for users who need to extend RS-232 transmission distance and increase networking capability. The device is bi-directional that allow one RS-232 port to be converted into an RS-422 or RS-485 port. With Moxa A53 you can control up to 32 devices within 1.2 km in a multidrop environment. Moxa A53 series is a legacy model. TNS recommends Moxa TCC 100I or TCC 80I series that offers more features. Feel free to contact TNS for a recommendation to your specific application.

To ease 2-wire RS-485 half-duplex control, Automatic Data Direction Control (ADDC) intelligence, which does not requires a baudrate switch setting, is designed into Moxa A53. This feature simplifies user's RS-485 software programming. Your applications can easily manage data transmitting and receiving via the half-duplex RS-485 port without additional code.  All RS-422/485 signals provide TVS protection. In addition Moxa A53 provides 2 KV of optical isolation protection for all signals at the RS-422/485 end.

Switch and jumper settings
To change the operation mode, please remove the two screws on the top of the converter, open the cover, and then use the array of sliding switches to set the desired mode. DIP switches are used to select the operation mode (RS-422 or RS-485). For RS-485 mode, the control mode (By RTS or ADDC) is also set by DIP switch.