Campbell CH201, Product Manual

Page: 33 / 44

downloadable example program that monitors power usage is available at
www.campbellsci.
eu
/downloads/ch201-program-examples .
7.3.1 SDI-12 communications
SDI-12 is a serial communications standard specifically designed for reading measurements from
multiple measurement sensors to data recorders, including Campbell Scientific data loggers.
Additional information about the SDI-12 protocol is available at www.SDI-12.org website and the
SDI-12 Sensors | Transparent Mode and SDI-12 Sensors | Watch or Sniffer Mode videos.
To communicate with the CH201 using SDI-12, connect the CH201 to the data logger as shown in
Table 7-2 (p. 23).
Table 7-2: Wiring for SDI-12 communications
CH201 connection CH201 terminal function Data logger connection
TX SDI-12 transmit and receive C or U
1
configured for SDI-12
G Ground ⏚ (analog
ue
ground)
1
U and C terminals are automatically configured by the measurement instruction.
FIGURE 7-3. CH201 connected to a CR1000X via SDI-12
CH201 12V Charging Regulator 23