Campbell CR800 Series - CPI Port and CDM Devices - Overview; Ports; SDM Port

Section 5. Overview
63
• One nine-pin DCE port, labeled RS-232, normally used to communicate
with a PC running datalogger support software
(p. 86), or to connect a
third-party modem. With a null-modem adapter attached, it serves as a
DTE device.
Read More See Serial Port Pinouts
(p. 553).
• Two-terminal (TX and RX) RS-232 ports can be configured:
o Up to Two TTL ports, configured from C terminals.
Note RS-232 ports are not isolated
(p. 503).
5.1.1.4.2 SDI-12 Ports
Read More See the section Serial I/O: SDI-12 Sensor Support — Details
(p. 240).
SDI-12 is a 1200 baud protocol that supports many smart sensors. Each port
requires one terminal and supports up to 16 individually addressed sensors.
• Up to two ports configured from C terminals.
5.1.1.4.3 SDM Port
SDM is a protocol proprietary to Campbell Scientific that supports several
Campbell Scientific digital sensor and comms input and output expansion
peripherals and select smart sensors.
• One SDM port configured from C1, C2, and C3 terminals.
5.1.1.4.4 CPI Port and CDM Devices — Overview
Related Topics:
• CPI Port and CDM Devices — Overview (p. 63)
• CPI Port and CDM Devices — Details (p. 455)
CPI is a new proprietary protocol that supports an expanding line of Campbell
Scientific CDM modules. CDM modules are higher-speed input- and output-
expansion peripherals. CPI ports also enable networking between compatible
Campbell Scientific dataloggers. Consult the manuals for CDM modules for
more information.
• Connection to CDM devices requires the SC-CPI interface.