DGH RS-232/RS-485 Converters  RS-485 Repeaters
The DGH A1000 and A2000 series converter boxes convert RS-232 communications signal levels to the correct electrical signals required by RS-485. RS-485 is recommended when many DGH modules, or other addressable devices, must be connected to a host computer over long distances. The A1000 and A2000 converters allow communications bus lengths up to 4,000 feet and baud rates up to 115.2K baud using one twisted pair of wires. RS-485 allows bi-directional data on the same pair of wires, therefore some means of arbitrating the data direction is required. The A1000 and A2000 converters automatically control the bus direction without the need for external handshaking signals from the host computer. Therefore, host software written for half-duplex RS-232 may be used without modification. The RS-485 bus control is completely transparent to the user. The A1000 and A2000 can also operate as repeaters for RS-485. 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 converters are powered by either 115Vac or 230Vac. The A2000 converters operate on a wide range of power supply input voltage: unregulated +10 to +30Vdc.   The A2400 is an RS-232/RS-485 converter designed to interface all DGH RS-485 products to radio and leased telephone line modems. Many radio and leased line modems require an RS-232 signal to activate, or "key-up",  the transmitter. They also require adequate time for the transmitter to turn on before transmitting any data. This transmitter turn-on delay time mandates that the data be delayed while the transmitter is turning on. The amount of delay time required varies between modem types and manufacturers.	A1000   A2000   A2400
A1000 - AC Powered (-115Vac, -230Vac) Mechanical Dimensions: 8.08"W x 2.50"H x 6.25"D A2000 - DC Powered (+10 to +30Vdc) Mechanical Dimensions: 7.06"W x 1.53"H x 5.30"D A2400 - DC Powered (+10 to +30Vdc) with RTS/CTS control A2400 Mechanical Dimensions CA-2 -  Serial Cable, 9 Pin Male to 9 Pin Female CA-3 -  Serial Cable, 9 Pin Female to Tin Lead

 

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