Veris Industries H84xx Install - Manual (Page 10)

Z204046-0J PAGE 10 ©2011 Veris Industries USA 800.354.8556 or +1.503.598.4564 / [email protected] 12115
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TM
H84xx INSTALLATION GUIDE
–
+
Belden 1120A or equivalent
120 Ω terminator on the
last device of the daisy chain*
Not used
COMMUNICATIONS
Communications Capabilities
RS-485 Communications Distances:
Baud Rate Maximum Communication Distances
Feet Meters
9600 8000 2438
19200 6000 1829
Note: Use distances as a guide only; they are not guaranteed. 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.
• If the power meter is the first device on the daisy chain, connect it to the
host device using a RS-232 to RS-485 converter.
• If the power meter is the last device on the daisy chain, terminate it with
the terminator provided.
• The first device on the chain should also have a 120 Ω terminator between
+ and -.
• The terminal’s voltage and current ratings are compliant with the
requirements of the EIA RS-485 communications standard
* A 120 Ω resistor is included on the circuit board inside the H8436VB/S and H8437VB/S units.