Campbell Scientific CR1000KD CR1000 Measurement and Control System - Page 202
I/O Ports, 8.8.3 Protocols
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Section 7. Installation 7.8.8.2 I/O Ports 7.8.8.3 Protocols 202 The CR1000 supports two-way serial communication with other instruments through ports listed in table CR1000 Serial Ports (p. 202). 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 31. CR1000 Serial Ports Serial Port Voltage Level RS-232 (9-pin) RS-232 CS I/O (9-pin) TTL COM1 (C1 - C2) TTL COM2 (C3 - C4) TTL COM3 (C5 - C6) TTL COM4 (C7 - C8) TTL C1 5 Vdc C3 5 Vdc C5 5 Vdc C7 5 Vdc C1, C2, C3 5 Vdc Logic Full-duplex asynchronous RS-232 Full-duplex asynchronous RS-232 Full-duplex asynchronous RS-232/TTL Full-duplex asynchronous RS-232/TTL Full-duplex asynchronous RS-232/TTL Full-duplex asynchronous RS-232/TTL SDI-12 SDI-12 SDI-12 SDI-12 SDM (used with Campbell Scientific peripherals only) PakBus is the protocol native to the CR1000 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 CR1000 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 CR1000. Read More! See SDI-12 Recording (p. 323), SDI-12 Sensor Support (p. 172), PakBus Overview (p. 351), DNP3 (p. 364), and Modbus (p. 367). Many instruments require non-standard protocols to communicate with the CR1000.