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Addressable Bus Converter | Model 8020-38

  • Model 8020-38 Addressable Bus Converter.
  • Model 8020-38 Addressable Bus Converter dimensions.
Model 8020-38

The Model 8020-38 Addressable Bus Converter provides the means to interface GEOKON Addressable Sensor Strings with a variety of systems, including personal computers, programmable logic controllers and dataloggers.

The Addressable Bus Converter acts as a bridge between USB- or TTL-capable readers and GEOKON RS-485-enabled sensor strings. The Model 8020-38 is placed in-line with the system and provides bidirectional signal conversion between USB and RS-485 or between TTL and RS-485.

Communication is performed over a half-duplex RS-485 connection using the Modbus® RTU protocol. The Model 8020-38 has user-resettable baud rates between 9600 bits per second and 115.2 kilobits per second (the default factory setting).


Power Supply Input
USB: 5 Volts DC 500 mA;
TTL: 12 Volts DC 500 mA
Power Supply Output
12 Volts DC 200 mA (max)
Sleep Current
500 µA Max (During USB Suspend)
Operating Current
15 mA (max)
RS-485 (half-duplex, two-wire differential);
USB 1.0 to USB 3.1;
5 V TTL (single-ended);
5 V TTL (single-ended, inverted)
Temperature Range
−40°C to +80°C
L × W × H
88.9 × 64.6 × 39.5 mm

Please Note: GEOKON maintains an ongoing policy of design review and reserves the right to amend products and specifications without notice. Various instruments are discontinued over time and replaced with new, updated models.

Modbus® is a registered trademark of SCHNEIDER ELECTRIC USA, INC. All other trademarks are the property of their respective owners.