Manual

9-2
9.3 SDI-12 INTERFACE
SDI-12 is an industry standard serial digital interface bus. The bus was designed to allow
compatibility between data collection devices and sensors of various manufacturers. The
description below applies specifically to the 6000
UPG implementation of SDI-12 interface. For
complete SDI-12 technical specifications please contact:
Campbell Scientific, Inc.
P.O. Box 551
Logan, Utah 84321
USA
[phone]
SDI-12 is a single master multi-drop bus. As many as 10 sensors can be connected to the bus at a
time. Each sensor is preassigned a unique address from 0 to 9. Each 6000
UPG is factory set to
address 0. The address can be changed in the System Setup menu (see Section 4.5). The 6000
UPG
implements the basic SDI-12 command set. Below are the descriptions of each command and their
responses. At the end of this section, you will find the 6000
UPG commands that are used to run and
troubleshoot SDI-12.
The following notations are used:
•
a 6000UPG SDI-12 address (ASCII '0' to '9')
• [CR] Carriage return (ASCII 13)
• [LF] Line feed (ASCII 10)
• Master Any SDI-12 compatible data collection device
Signal Dir Function COLOR
-----------------------------------------------------------------------------------------------------------------------
Shield Shield ground BARE
SDIDAT I/O SDI-12 data PURPLE
TX OUT RS-232 Transmit data YELLOW
SGND - RS-232 signal ground GREEN
RX IN RS-232 Receive data ORANGE
PWR IN SDI-12 power RED
PGND - SDI-12 ground BLACK