Rs-485/rs-422 communication comparison – Rockwell Automation 1398-DDM-xxx ULTRA 100 Series Drives Installation Manual User Manual

Page 100

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Publication 1398-5.2 – PDF 1997

6-36

Interfaces

D. Select PC Set Up from the pull down menu.

E. Verify the port settings, and if necessary, change them, then

choose OK.

4. Verify the ability to communicate between the computer and the

connected drives by:

A. Switch drive power to ON

B. Select Communications from the menu

C. Select Read Drive Parameters from the pull down menu

D. Select the drive to communicate with from Drive Select

window. The drive must have an address that matches one of
the drive addresses in the chain. A list of connected drives can
be generated by pushing the “Scan Port for Attached Drives”
button.

E. Choose OK in the Drive Select window.

Figure 6.41

RS-485/RS-422 Communication Comparison

Four Wire RS-485

Differential
4 Wires
2 Signal pairs
1 to 32 transmitters
1 to 32 receivers

RS-422

Differential
4 Wires
2 Signal pairs
1 Transmitter
1 to 10 receivers

RS-485 Standard

Differential
2 Wires
1 Signal pair
1 to 32 transmitters
1 to 32 receivers

NOTE

:

Not applicable to ULTRA 100 Series drives

Note: Do not connect any device to J5-6 or J5-9 except a TouchPad.

Note: Flat ribbon cabling is not recommended for RS-485 connections.

1

2

32

1

2

10

1

2

32

Note: Address 0 is the preferred address for the initial configuration
of a drive. It forces the drive to the default communications parameters.

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