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RS-232 to RS-485 Serial Communications Converters

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The DGH A1000 Series RS-232 to RS-485 Serial Communications Converters boxes will convert RS232 signal levels to the correct electrical signals required by RS485. RS485 is recommended when many DGH modules, or other addressable devices, must be connected to a host computer over long distances. The A1000 converters allow communications bus lengths up to 4,000 feet and baud rates up to 115.2K baud using one twisted pair of wires.

RS485 allows bi-directional data on the same pair of wires, therefore some means of arbitrating the data direction is required. The A1000 converters automatically control the bus direction without the need for external handshaking signals from the host computer. Therefore, host software written for half-duplex RS232 may be used without modification. The RS485 bus control is completely transparent to the user.

Use the CA-2 cable to connect to a host computer 9 pin serial port.

The A1000 can also operate as an RS-485 repeater. RS-485 repeaters are required to extend communications bus lengths or allow more than 32 devices to be connected to a communications bus.

The A1000 contains an internal +24Vdc one amp power supply for powering DGH modules.

 
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A1000-RS232/RS485 Converter
 
Documentation

  Data Sheet     Users Manual
 
AC Powered Converters
 A1000-115 115VAC, RS232/RS485 Converter
 A1000-230 230VAC, RS232/RS485 Converter
  The A1000 mechanical dimensions are: 8.08"W x 2.50"H x 6.25"D  
A1000 Series Accessories
  CA-2 Serial Cable, 9 Pin Male to 9 Pin Female
 
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