Campbell-scientific CR3000 Micrologger Uživatelský manuál Strana 207

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Section 7. Installation
207
7.8.8.2 I/O Ports
The CR3000 supports two-way serial communication with other instruments
through ports listed in table CR3000 Serial Ports
(p. 207). 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, C5, C7).
Connect sensor TX (transmit, pin 3) to datalogger Rx (receive, channel C2,
C4, C6, C8).
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 33. CR3000 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
COM3 (C5 - C6)
TTL Full-duplex asynchronous RS-232/TTL
COM4 (C7 - C8)
TTL Full-duplex asynchronous RS-232/TTL
C1
5 Vdc SDI-12
C3
5 Vdc SDI-12
C5
5 Vdc SDI-12
C7
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 CR3000 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 CR3000 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 CR3000.
Read More! See SDI-12 Recording
(p. 328), SDI-12 Sensor Support (p. 177), PakBus
Overview (p. 356), DNP3 (p. 369), and Modbus (p. 372).
Many instruments require non-standard protocols to communicate with the
CR3000.
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