Rockwell Automation 1404-M4_M5_M6_M8 Powermonitor 3000 Installation Instructions, PRIOR to Firmware rev. 3.0 - Manual (Page 39)

Publication 1404-IN007D-EN-P - October 2004
Powermonitor 3000 39
If required, install suitable terminating resistors at the ends of the
daisy-chain cable. For RS-485, install a 150 ohm, 1/4 watt terminating
resistor (refer to the wiring diagram). Note that some RS-485
conversion devices are equipped with internal terminating resistors.
Contact the manufacturer of the converter for additional information.
At each end of each cable segment, connect the cable shields to the
SHLD terminal of the Master Module RS-485 port or the converter. The
SHLD connection provides a low-impedance ground for
high-frequency noise while attenuating DC or line-frequency signals.
The RS-485 port in the Master Module presents a standard load
impedance to the RS-485 network, allowing the standard 32 nodes on
a network.
Configuration options for the native RS-485 port include the protocol,
device address and the data rate. Defaults are:
•
Auto-detect protocol
•
Device address = the Device ID assigned at the factory in the
range 1 to 254
•
Baud rate = 9600
Use of RS-232 to RS-485 converter
You need a user-supplied RS-232 to RS-485 converter for
communication between the Powermonitor 3000 native RS-485 port
and an external device such as a computer or programmable
controller RS-232 port. Examples of these include:
•
B&B Electronics, Inc. part number 485SD9TB (DB-9 connection)
•
Allen-Bradley catalog number 1761-NET-AIC