Solinst 2-wire signals are converted to SDI-12 signals by the Solinst SDI-12 Interface Cable. One end of this cable has three wires which connect to an SDI-12 datalogger. These wires are colour-coded according to Table 1-1. The other end of the cable terminates in a Direct Read connection. This connects to the top of a Direct Read Cable for connection to a Solinst Levelogger. The Solinst Levelogger has a self-contained battery and does not use +12V DC power. The SDI-12 Interface Cable circuitry requires the 12V connection. The current draw is nominally around 15 - 25 mA at 12V DC. Idle current draw is ~0.1 mA.
|Wire Colour||SDI-12 Function||Connection|
|Red||12 Volt Line||+12V DC at SDI-12 Datalogger|
|Black||Ground Line||Ground at SDI-12 Datalogger|
|White||Serial Data Line||SDI-12 Data at SDI-12 Datalogger|
Table 1-1 SDI-12 Interface Cable Wire Definitions
The communication settings for the Solinst SDI-12 Interface Cable hardware comply with the SDI-12 standard at 1200 baud, 1 start bit, 7 data bits, 1 parity bit (even parity), and 1 stop bit.
|Standard Compliance||SDI-12 Standard, Version 1.3, July 18, 2005|
|Average Current Draw While Taking Readings||15-25 mA|
|Idle Current Draw||~0.1 mA|
|Direct Read Cable – Max Length||1500 ft|
|SDI-12 Cable Length – Max Length||200 ft|
Table 1-2 SDI-12 Technical Specifications