Power Meter Bulletin No. 3020IM9503R6/98
Chapter 6—Communications December 1998
40 1998 Square D All Rights Reserved
Figure 6-4: Power meters connected to a personal computer via serial port
CONNECTING TO A PC USING MODBUS OR JBUS COMMUNICATIONS
• Connect up to 32 Modbus or Jbus devices to a personal computer (figure
6-4). See Length of the Communications Link in this chapter for distance
limitations at varying baud rates.
• Power meters configured for Modbus or Jbus can be connected to a serial
communications port on the personal computer. To do this, the power
meters must be connected to an RS-232-to-RS-422/RS-485 converter, which
is connected to the personal computer. POWERLOGIC offers a converter
kit for this purpose (Class 3090 Type MCI-101; refer to the instruction
bulletin included with the MCI-101 for connection instructions).
1–32 Devices (Power Meters and
Other Modbus- or Jbus-Compatible Devices)
MCTAS-485
(or MCT-485
with
Terminal
Block)
Belden 8723
(or equivalent)
MCA-485
CAB-108
CAB-104
RS-232/
RS-485
Converter
Modbus Host
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