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RS232 to RS422/RS485 Converter, Auto RTS Toggling Support US$64.00

RS232 to RS422/RS485 Converter, Auto RTS Toggling Support

The CS-428-9AT-mini converts RS232 signals to RS422 or RS485. It operates with no extra software installation - all operation modes can be configured via DIP switches.

RS232 to RS422/RS485 Converter Highlights

  • Small size, only 35.87 x 33.95mm
  • Fully compatible with PC RS232 serial COM ports
  • No external power needed. Uses non-polar T/B when operating with external power.
  • Enables the use of external DC power supply (7~12V) Built in Surge Protector
  • RTS Auto Toggling by hardware
  • Communication status can be monitored through LEDs
  • Dip switch for selecting RS422/485 modes, Terminal Resistance and Echo mode
  • Max. 10 Device Connectivity for RS422 Multi-Drop Mode
  • Max. 32 Device Connectivity for RS485 Mode

Auto RTS Control (Auto Toggling)

In a 1:N communication environment it is undesirable that multiple devices send data at the same time as it causes data collisions that lead to data errors. To prevent this only one device can send data at any given time, which means that data I/O control is necessary. The CS-428/9AT-mini performs automatic toggling of the RTS line by hardware, eliminating the need to implement data flow control in software.

RS485 Echo Mode

The CS-428/9AT can be configured for Echo or non-Echo mode. In RS485 Echo Mode the output signal (TX) is routed back to the Input (RX). This mode can, for example, be used to diagnose RS485 bus data collisions. The CS-428/9AT implments echo mode in hardware.

Mode Asynchronous serial communication
Speed Up to 115.2 kbps
Distance Max. 1.2Km @ 115.2Kbps, 24AWG twisted pair cable
Connector RS232: DB9 Female
RS422/485: Terminal Block 5P
Signals TXD, RXD, RTS, CTS, GND for RS232
Protection 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 Auto Toggling
DIP Switches - RS422/485 selection
- RS485 Echo/non-Echo selection
- RS422 Term. Resistor setting
- RS485 Term. Resistor setting
OS No Software Required
Power Input 7V to 12V DC
Power Consumption 0.4W (33mA @ 12V)
LED Power, TX, RX
Dimensions 39(W) 38(H) 16(D) mm
Weight 21g
Enclosure Plastic (Blue Color)
Operating Temp. 0 to 55 C (32 to 131 F)
Storage Temp. -20 to +70 C (-4 to +158 F)
Humidity 5% to 95% Non-Condensing
CE Class A, FCC Class A, RoHS Compliant

RS232 to RS422/RS485 Converter Resources

Optional Recommended Products for this Item
Serial Cable, 6ft., DB9 M/F+ US$6.00

This product was added to our catalog on Wednesday 16 March, 2011.


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RS232 to RS422/RS485 Converter with Automatic RTS ControlRS232 to RS422/RS485 Converter with Automatic RTS ControlUS$60.00

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