Campbell Scientific CR1000KD CR800 and CR850 Measurement and Control Systems - Page 527
Appendix C. Serial Port Pinouts
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Appendix C. Serial Port Pinouts C.1 CS I/O Communications Port Pin configuration for the CR800 CS I/O port is listed in table CS I/O Pin Description (p. 527). Table 119. CS I/O Pin Description ABR: Abbreviation for the function name. PIN: Pin number. O: Signal Out of the CR800 to a peripheral. I: Signal Into the CR800 from a peripheral. PIN ABR I/O Description 1 5 Vdc O 5V: Sources 5 Vdc, used to power peripherals. 2 SG Signal Ground: Provides a power return for pin 1 (5V), and is used as a reference for voltage levels. 3 RING I Ring: Raised by a peripheral to put the CR800 in the telecommunications mode. 4 RXD I Receive Data: Serial data transmitted by a peripheral are received on pin 4. 5 ME O Modem Enable: Raised when the CR800 determines that a modem raised the ring line. Synchronous Device Enable: Used to address Synchronous 6 SDE O Devices (SDs), and can be used as an enable line for printers. Clock/Handshake: Used with the SDE and TXD lines to 7 CLK/HS I/O address and transfer data to SDs. When not used as a clock, pin 7 can be used as a handshake line (during printer output, high enables, low disables). 8 +12 Vdc 9 TXD Transmit Data: Serial data are transmitted from the CR800 to peripherals on pin 9; logic-low marking (0V), logic-high O spacing (5V), standard-asynchronous ASCII, 8 data bits, no parity, 1 start bit, 1 stop bit, 300, 1200, 2400, 4800, 9600, 19,200, 38,400, 115,200 baud (user selectable). C.2 RS-232 Communications Port C.2.1 Pin-Out Pin configuration for the CR800 RS-232 nine-pin port is listed in table CR800 RS232 Pin-Out (p. 528). Information for using a null modem with RS-232 is given in table Standard Null-Modem Cable or Adapter-Pin Connections (p. 529). The CR800 RS-232 port functions as either a DCE (data communication equipment) or DTE (data terminal equipment) device. For RS-232 to function as a DTE device, a null modem cable is required. The most common use of RS-232 is as a connection to a computer DTE device. A standard DB9-to-DB9 cable can 527