 The HA5-30 is a RS485 to 1-Wire interface, which provides an
ASCII command set for embedded controller and PC based applications that
need to accommodate Dallas Semiconductor iButton and EDS 1-Wire sensors and
controls. The HA5-30 provides 30 independently dampened 1-Wire sub-networks providing
a total of up to 2000 feet of CAT-5 network cable and up to 200 1-Wire devices.
This design allows an RS485 backbone of up to 4000 ft. of CAT-5 cable to connect
as many as 26 HA5-30 sub-network junctions of up to 200 1-Wire devices each. This
arrangement provides a workable topology for wiring large buildings.
The HA5-30 relieves the host of the burden of generating the time-critical 1-Wire
communication waveforms while supporting all 1-Wire devices with simple ASCII commands
that can be easily generated. The HA5-30 does all the hard work of interfacing 1-Wire
networks. RS485 multidrop provides as many as 26 1-Wire networks from a single host
serial-port, broadcast radio or modem. The HA5-30 can perform Search, Conditional
search and Family search functions making it easy to acquire the unique 64 bit serial
numbers of all connected devices. The HA5-30 constantly performs a dynamic analysis
of the network and adjusts the network timing to allow for variable conditions.
This results in good performance with both short and long networks with many or
only a few devices attached. Many sensor devices require extra power to be delivered
during periods of data conversions (DS1920 and DS1820 temperature sensors for example).
The HA5-30 automatically provides the extra current these devices require with a
built in smart strong-pull-up. Dallas Semiconductor iButtons which store data in
TMEX Touch Memory File format can be read or written with simple ASCII commands.
The HA5-30 will automatically generate and check the CRC16 error checks from Touch
Memory File records. The HA5-30 supports analog, digital, and temperature 1-Wire
devices and all Dallas Semiconductor iButtons.
Features
- ASCII command support for all 1-Wire devices.
- RS485 Multidrop with user selectable address (1 of 26).
- 30 1-Wire sub-networks each individually dampened.
- All connections are quick-connect screw connectors.
- Automatically adjusts for variable 1-Wire bus conditions.
- 2000 feet, 200 devices per CAT-5 twisted pair 1-Wire bus.
- Supports up to 26 1-Wire networks per host serial port.
- User selectable Baud rates from 1200 to 115K Baud.
- User selectable error-check mode.
- Pass Through RS485 and Power for easy network connection.
- Provides Search, Conditional search and Family search commands.
- Supports Touch Memory File Structure for Dallas Semiconductor iButtons.
- Automatically generates and checks CRC16 for TMEX files.
- Block mode commands support all 1-Wire device functions.
- ESD Protection more than 27kV (IEC801-2 Reference Model.) on the 1-Wire
bus.
- Enclosed electronics.
Specifications
- Supply Voltage: 5-16 Volts
- Supply Current: 9-12 mA
- 1-Wire Devices: 200 per bus devices
- CAT-5 Cable length: 2000 feet per bus
- Baud Rate: 1200-115K Baud
iButton and 1-Wire are registered trademarks of Dallas Semiconductor Corporation.
TMEX is a trademark of Dallas Semiconductor Corporation.
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