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.


12 Volt Line
+12V DC at SDI-12 Datalogger
Ground Line
Ground at SDI-12 Datalogger
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


Supply Current

15-25 mA

Direct Read (green) Cable - Max Length

1500 ft

SDI-12 Cable Length

200 ft
Environmental IP-65