Specifications

Section 3. Overview

3-8

3.1.6 Communications

Read more! See Section 13 Telecommunications and Data Retrieval.

The CR1000 communicates with external devices to receive programs, send

data, or act in concert with a network. The primary communication protocol is

PakBus. Modbus and DNP3 communication protocols are also supported.

3.1.6.1 PakBus

Read more! See Section 14 PakBus Overview.

The CR1000 communicates with Campbell Scientific support software,

telecommunication peripherals, and other dataloggers via PakBus, a proprietary

network communications protocol. PakBus is a protocol similar in concept to

IP (Internet protocol). By using signatured data packets, PakBus increases the

number of communications and networking options available to the CR1000.

Communication can occur via RS-232, CS I/O, or digital I/O ports.

Advantages of PakBus:

• Simultaneous communication between the CR1000 and other devices.

• Peer-to-peer communication — no PC required.

• Other PakBus dataloggers can be used as “sensors” to consolidate all data

into one CR1000.

• Routing - the CR1000 can act as a router, passing on messages intended

for another logger. PakBus supports automatic route detection and

selection.

• Short distance networks with no extra hardware - A CR1000 can talk to

another CR1000 over distances up to 30 feet by connecting transmit,

receive and ground wires between the dataloggers. PC communications

with a PakBus datalogger via the CS I/O port, over phone modem or radio,

can be routed to other PakBus dataloggers.

• Datalogger to datalogger communications - special CRBASIC instructions

simplify transferring data between dataloggers for distributed decision

making or control.

• In a PakBus network, each datalogger is set to a unique address before

installed in the network. Default PakBus address is 1. To communicate

with the CR1000, the datalogger support software (see Section 13) must

know the CR1000’s PakBus address. The PakBus address is changed

using the CR1000KD Keyboard Display, DevConfig software, CR1000

status table, or PakBus Graph software.

3.1.6.2 Modbus