Communications ports

The data logger is equipped with ports that allow communications with other devices and networks, such as:

Campbell Scientific data logger communications ports include:

  • CS I/O
  • CPI/RS-232
  • EPI
  • CAN bus (GRANITE 10 only)
  • USB Device
  • USB Host
  • Ethernet
  • C terminals

USB device port

The USB device port supports communicating with a computer through Closeddata logger support software LoggerNet, RTDAQ, and PC400 - these Campbell Scientific software applications include at least the following functions: data logger communications, downloading programs, clock setting, and retrieval of measurement data. or through virtual Ethernet (ClosedRNDIS Remote Network Driver Interface Specification - a Microsoft protocol that provides a virtual Ethernet link via USB.), and provides 5 VDC power to the data logger (powering through the USB port has limitations - details are available in the specifications). The data logger USB device port does not support USB flash or thumb drives. Although the USB connection supplies 5 V power, a 12 VDC battery will be needed for field deployment.

USB host port

USB host provides portable data storage on a USB thumb drive. A FAT32-formatted USB thumb drive can be inserted into the host port and will show up as a drive (USB:) in file-related operations. Measurement data is stored on USB: as discrete files by using the TableFile() instruction. Files on USB: can be collected by inserting the thumb drive into a computer and copying the files.

USB: can be used in all CRBasic file-access-related instructions. Because of data reliability concerns in non-industrial rated drives, this drive is not intended for long-term unattended data storage. Rather, configure Tablefile() for milking (plug-and-pull) to periodically collect data. Files on USB: are not affected by program recompilation or formatting of other drives.

See the CRBasic Editor help for detailed instruction information and program examples:

https://help.campbellsci.com/crbasic/granite10/ , https://help.campbellsci.com/crbasic/granite9/

Ethernet port

The RJ45 10/100/1000 Ethernet port is used for IP communications.

C terminals for communications

C terminals are configurable for the following communications types:

  • SDI-12
  • RS-232
  • RS-422
  • RS-485
  • TTL (0 to 5 V)
  • LVTTL (0 to 3.3 V)
  • SDM

Some communications types require more than one terminal, and some are only available on specific terminals. See Communications specifications for more information.

SDI-12 ports

ClosedSDI-12 Serial Data Interface at 1200 baud. Communications protocol for transferring data between the data logger and SDI-12 compatible smart sensors. is a 1200 baud protocol that supports many smart sensors. C1, C3, C5, and C7 can be configured as SDI-12 ports. Maximum cable lengths depend on the number of sensors connected, the type of cable used, and the environment of the application. Refer to the sensor manual for guidance.

For more information, see SDI-12 communications.

RS-232, RS-422, RS-485, TTL, and LVTTL ports

RS-232, RS-422, RS-485, TTL, and LVTTL communications are typically used for the following:

  • Reading sensors with serial output
  • Creating a multi-drop network
  • Communications with other data loggers or devices over long cables

Configure C terminals as serial ports using ClosedDevice Configuration Utility Software tool used to set up data loggers and peripherals, and to configure PakBus settings before those devices are deployed in the field and/or added to networks. Also called DevConfig. or by using the SerialOpen() CRBasic instruction. Terminals are configured in pairs for TTL, LVTTL, RS-232, and half-duplex RS-422 and RS-485 communications. For full-duplex RS-422 and RS-485, four terminals are required. See also Communications protocols.

NOTE:

RS-232 ports are not isolated.

SDM ports

SDM is a protocol proprietary to Campbell Scientific that supports several Campbell Scientific digital sensor and communications input and output expansion peripherals and select smart sensors. It uses a common bus and addresses each node. CRBasic SDM device and sensor instructions configure terminals C1, C2, and C3 together to create an SDM port. Alternatively, terminals C5, C6, and C7 can be configured together to be used as the SDM port by using the SDMBeginPort() instruction.

See also Communications specifications.

CS I/O port

One nine-pin port, labeled CS I/O, is available for communicating with a computer through Campbell Scientific communications interfaces, modems, and peripherals. Campbell Scientific recommends keeping CS I/O cables short (maximum of a few feet). See also Communications specifications.

CS I/O pinout
Pin
number		 Function Input (I)
Output (O)		 Description
1 5 VDC O 5 VDC: 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 GRANITE 9/10 in the telecom 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 GRANITE 9/10 determines that a modem raised the ring line.
6 SDE O Synchronous device enable: addresses synchronous devices (SD); used as an enable line for printers.
7 CLK/HS I/O Clock/handshake: with the SDE and TXD lines addresses and transfers 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   Nominal 12 VDC power. Same power as 12V and SW12 terminals.
9 TXD O Transmit data: transmits serial data from the data logger to peripherals on pin 9; logic-low marking (0V), logic-high spacing (5V), standard-asynchronous ASCII: eight data bits, no parity, one start bit, one stop bit. User selectable baud rates: 300, 1200, 2400, 4800, 9600, 19200, 38400, 115200.

CPI/RS-232 port

The data logger includes one RJ45 module jack labeled ClosedRS-232 Recommended Standard 232. A loose standard defining how two computing devices can communicate with each other. The implementation of RS-232 in Campbell Scientific data loggers to computer communications is quite rigid, but transparent to most users. Features in the data logger that implement RS-232 communications with smart sensors are flexible./CPI. ClosedCPI CPI is a proprietary interface for communications between Campbell Scientific data loggers and Campbell Scientific CDM peripheral devices. It consists of a physical layer definition and a data protocol. is a proprietary interface for communications between Campbell Scientific data loggers and Campbell Distributed Modules (CDMs) such as the GRANITE-Series peripheral devices and smart sensors. It consists of a physical layer definition and a data protocol. CDM devices are similar to Campbell Scientific ClosedSDM Synchronous Device for Measurement. A processor-based peripheral device or sensor that communicates with the data logger via hardwire over a short distance using a protocol proprietary to Campbell Scientific. devices in concept, but the CPI bus enables higher data-throughput rates and use of longer cables. Some GRANITE devices may require more power to operate in general than do SDM devices. Consult the manuals for GRANITE modules for more information.

NOTE:

CPI/RS-232 port is not isolated.

CPI port power levels are controlled automatically by the GRANITE 9/10:

  • Off: Not used.
  • High power: Fully active.
  • Low-power standby: Used whenever possible.
  • Low-power bus: Sets bus and modules to low power.

When used with a Campbell Scientific RJ45-to-DB9 converter cable, the CPI/RS-232 port can be used as an RS-232 port. It defaults to 115200 bps (in autobaud mode), 8 data bits, no parity, and 1 stop bit. Use Device Configuration Utility or the SerialOpen() CRBasic instruction to change these options.

RS-232/CPI pinout
Pin number Description
1 RS-232: Transmit (Tx)
2 RS-232: Receive (Rx)
3 100 Ω Res Ground
4 CPI: Data
5 CPI: Data
6 100 Ω Res Ground
7 RS-232 CTS CPI: Sync
8 RS-232 DTR CPI: Sync
9 Not Used

EPI port

The data logger includes two RJ45 module jacks labeled EPI. Ethernet Peripheral Interface (EPI) is a proprietary interface for communications between Campbell Scientific data loggers and Campbell Distributed Modules (CDMs) such as the GRANITE-Series peripheral devices and smart sensors. EPI expands the functionality or channel count of the GRANITE 9/10. This communications connection satisfies the tight timing requirements imposed on independent GRANITE Measurement Modules that are working together as part of a measurement and control system.

The underlying communications of EPI are built using TCP/IP. More specifically, the IEEE 1588 protocol is implemented at the lowest hardware levels for synchronization of device clocks across the entire network. This accomplishes tighter device synchronization and 100-times the data throughput of CPI. The additional power, cost, and complexity are warranted for fast sampling applications.

CAN port (GRANITE 10 only)

The CAN (Controller Area Network) physical layer is a differential signal that is generally a twisted pair. The GRANITE 10 has 4 general purpose CAN ports, CAN 2.0 up to 1 Mbps, or CAN FD up to 5 Mbps. They can be accessed either by the screw terminals, or the 15-pin connector; they are electrically connected. Wire the differential signal (H and L) into the screw terminals, or use a custom cable and the 15-pin connector.

CAN bus pinout
Pin Number Description
1 CAN1 H
2 CAN1 L
3 RG1
4 CAN2 H
5 CAN2 L
6 RG2
7 CAN3 H
8 CAN3 L
9 RG3
10 CAN4 H
11 CAN4 L
12 RG4
13 Not used
14 Not used
15 Not used