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.