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12 bluac5 s/q hardware manual – Applied Motion BLuAC5-Q User Manual

Page 12

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12

BLuAC5 S/Q Hardware manual

920-0049 Rev. C

12/8/2014

Our RS-485 implementation is a 4-wire multi-drop network with separate transmit and receive
wires. One pair of wires connects from the host computer’s TX+ and TX- signals to each
drive’s RX+ and RX- terminals. Another pair connects the TX+ and TX- drive terminals to the
host computer’s RX+ and RX- signals. A common ground terminal is provided on each drive
and should be used to keep all drives at the same ground potential. Connect one drive’s GND
terminal to the host computer ground.
Before wiring the entire system, you’ll need to connect each drive individually to the host
computer so that a unique address can be assigned to each drive. Proceed as follows: (Also
see figure #1 below)

1. Connect the drive TX+ to the PC’s RX+ terminal.
2. Connect the drive TX- to PC RX-.
3. Connect RX+ to TX+.
4. Connect RX- to TX-.
5. Connect GND to GND.

Getting and Connecting a RS485 4-wire adaptor to your PC

Model 117701 from

Jameco Electronics

(800-831-4242) works well. This adaptor is for a 25

pin serial port. If you are like most people and have a 9 pin serial port on your PC, you will
also need to purchase Jameco cable 31721. Connect as follows:

adaptor drive

1

RX+

2

RX-

3

TX-

4

TX+

Set the switches for DCE and TxON,RxON. Don’t forget to plug in the DC power adaptor that
comes with the unit.

+RX- +TX- GND

+RX- +TX- GND

+RX- +TX- GND

to PC TX+

to PC TX-

to PC RX+

to PC RX-

to PC GND

Drive #1

Drive #2

Drive #3

4-Wire RS-485 Figure #1

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