Campbell-scientific CR800 and CR850 Measurement and Control Systems Uživatelský manuál Strana 203

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Section 7. Installation
203
7.8.8.2 I/O Ports
The CR800 supports two-way serial communication with other instruments
through ports listed in table CR800 Serial Ports
(p. 203). A serial device will often
be supplied with a nine-pin D-type connector serial port. Check the manufacture's
pinout for specific information. In most cases, the standard nine-pin RS-232
scheme is used. If that is the case then,
Connect sensor RX (receive, pin 2) to datalogger Tx (transmit, channel C1,
C3).
Connect sensor TX (transmit, pin 3) to datalogger Rx (receive, channel C2,
C4).
Connect sensor ground (pin 5) to datalogger ground (G terminal)
Note Rx and Tx lines on nine-pin connectors are sometimes switched by the
manufacturer.
Table 31. CR800 Serial Ports
Serial Port Voltage Level Logic
RS-232 (9-pin)
RS-232 Full-duplex asynchronous RS-232
CS I/O (9-pin)
TTL Full-duplex asynchronous RS-232
COM1 (C1 - C2)
TTL Full-duplex asynchronous RS-232/TTL
COM2 (C3 - C4)
TTL Full-duplex asynchronous RS-232/TTL
C1
5 VDC SDI-12
C3
5 VDC SDI-12
C1, C2, C3
5 VDC
SDM (used with Campbell Scientific
peripherals only)
7.8.8.3 Protocols
PakBus is the protocol native to the CR800 and transparently handles routine
point-to-point and network communications among PCs and Campbell Scientific
dataloggers. Modbus and DNP3 are industry-standard networking SCADA
protocols that optionally operate in the CR800 with minimal configuration by the
user. PakBus®, Modbus, and DNP3 operate on the RS-232, CS I/O, and four
COM ports. SDI-12 is a protocol used by some smart sensors that requires
minimal configuration on the CR800.
Read More! See SDI-12 Recording
(p. 308), SDI-12 Sensor Support (p. 173), PakBus
Overview (p. 334), DNP3 (p. 347), and Modbus (p. 350).
Many instruments require non-standard protocols to communicate with the
CR800.
Note If an instrument or sensor optionally supports SDI-12, Modbus, or DNP3,
consider using these protocols before programming a custom protocol. These
higher-level protocols are standardized among many manufacturers and are easy
to use, relative to a custom protocol. SDI-12, Modbus, and DNP3 also support
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