User Manual, Firmware rev. 3.0 or LATER Owner's manual

64 Publication 1404-UM001F-EN-P - November 2009
Chapter 4 Communication
If you choose to configure communication parameters by using
communication, please refer to the Native Communication
Configuration table and the Optional Communication Configuration
Parameters table in Appendix A.
Native RS-485 Communication
Your Powermonitor 3000 unit is set up to communicate via its native
RS-485 port when you first power it up, except for units with an
optional RS-232 communication port. The communication
configuration includes the following parameters:
• Protocol: Allen-Bradley DF1 full-duplex, DF1 half-duplex slave,
Modbus RTU slave, or auto-sense. Default auto-sense
• Data communication rate: Range 1.2, 2.4, 4.8, 9.6, 19.2, 38.4, and
57.6 Kbps. Default 9.6 Kbps
• Delay: Range 0…75 ms, 10 ms default
• Data Format: 8 data bits, 1 stop bit, no parity, odd parity or even
parity. Default no parity
• Node address: Range 1…247, default is the same value as the
unit ID listed on the nameplate
• Inter-character timeout: Range 0…6553 ms
Default 0 (= 3.5 character times)
• Error checking: CRC (default), BCC
The Delay parameter is the time the power monitor waits before its
response to an external request. Certain communication equipment
requires such a delay for reliable operation.
With a half-duplex protocol selected, you may connect your power
monitor into a multi-drop RS-485 network with up to 32 nodes. You
must use a device configured as a master to communicate with this
port. All devices on the RS-485 network must be set at the same data
rate.
With the DF1 full-duplex protocol selected, the power monitor
communicates with another DF1 full-duplex initiator device over a
point-to-point link.
TIP
The native communication port does not support Data Highway 485
(DH-485) communication. Although DH-485 uses the RS-485 physical
media, its protocol is not compatible with the DF1 protocol.