Bulletin No. 3020IM9503R6/98 Power Meter
December 1998 Chapter 6—Communications
1998 Square D All Rights Reserved 35
CHAPTER 6—COMMUNICATIONS
PROTOCOLS
POWERLOGIC Power Meters can communicate using three different proto-
cols:
• POWERLOGIC
• Modbus
• Jbus
During setup, select which protocol will be used.
Descriptions of the connections that can be used with each protocol follow.
Note: For 2-wire Modbus and Jbus information, see Appendix H—2-Wire Modbus
and Jbus.
POWERLOGIC PROTOCOL COMMUNICATIONS WIRING
POWERLOGIC devices are equipped with RS-485 communications. You can
daisychain up to 32 POWERLOGIC (or Power Monitoring and Control
System [PM&CS]) compatible devices to a single communications port. This
document refers to a chain of PM&CS devices connected by communications
cable as a communications link.
A PM&CS communications link can consist of up to 32 PM&CS-compatible
devices connected to a communications port on one of the following:
• Personal computer
• POWERLOGIC Network Interface Module (PNIM)
• SY/MAX
programmable controller
• POWERLOGIC Ethernet Gateway
• Other host devices with a POWERLOGIC-compatible port
Figures 6-1 through 6-3 show power meters (other PM&CS-compatible
devices can be substituted) connected in typical systems. The accompanying
text describes important considerations for each connection alternative.
The figures also show the placement of communications adapters and
terminators. For additional information on using the communications adapter
and terminator, see Terminating the Communications Link, and Biasing the
Communications Link in this chapter.
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