PM700 Trilingual.book Page 25 Monday, April 12, 2004 9:47 AM
Chapter 5 — Communications (PM710)
Communications Capabilities (PM710)
ENGLISH
63230-501-201A3
4/2004
Communications Capabilities (PM710)
CHAPTER 5 — COMMUNICATIONS (PM710)
Table 5–1:
RS-485 Communications Distances
Baud Rate
Maximum Communication Distances
1 to 32 Devices
Feet
Meters
9600
8,000
2,438
19200
6,000
1,829
NOTE: Distances listed should be used as a guide only and cannot be
guaranteed for non-POWERLOGIC devices. Refer to the master device’s
documentation for any additional distance limitations.
Daisy-chaining Devices to the Power Meter
The RS-485 slave port allows the power meter to be connected in a daisy chain with up to 31, 2-wire
devices. In this bulletin, communications link refers to a chain of devices that are connected by a
communications cable. See Figure 5–1.
Figure 5–1:
Daisy-chaining 2-wire devices
PLSD110087
Belden 9841 or equivalent
MCT2W-485 terminator on the
last device of the daisy chain
–
+
Not used
Power Meter 710 or other POWERLOGIC 2-wire compatible devices
Belden 9841 wire colors: blue with white stripe (+), white with blue stripe (–), and silver (shield)
•
•
•
•
If the power meter is the first device on the daisy chain, connect it to the host device using a
RS-232 to RS-422/RS-485 converter.
If the power meter is the last device on the daisy chain, terminate it with the terminator provided.
See Table 5–1 for the maximum daisy-chain communications distances for 2-wire devices.
The terminal’s voltage and current ratings are compliant with the requirements of the EIA RS-485
communications standard.
© 2004 Schneider Electric. All Rights Reserved.
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