1.2 SDI-12 Interface Cable

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.


Technical Specifications
Standard Compliance SDI-12 Standard, Version 1.3, July 18, 2005
+12V Input 9.6V-16.0V
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
Environmental IP-65

Table 1-2 SDI-12 Technical Specifications