Connection RS-485 for the climate control ESPEC Chamber

Hi all

I'm having some difficulties of implementation and the RS485 connection with ESPEC climate control room.

It is a room of climate ARL-0680. The climate Chamber has two connectors male DB9 on the outside, apparently used to connect several rooms to RS - 485.

The pinout of the connector RS485 DB9 real is:

1: Data Transmission SD + (A) connected

2: SD-Transmission data (B) connected

3: data reception RD + (A) connected

4: data RD-reception (B) connected

5: GND mass connected

6: GND mass connected

7: NC (not connected) not connected

8: NC (not connected) not connected

9: NC (not connected) not connected

I bought a cable interface OR USB-485. This cable also has a DB9 Male interface but the pinout is different.

1: GND

2: CTS + (HSI)

3: RTS + (HSO)

4: RXD +.

5: RXD -.

6: CTS-(HSI) -

7: RTS-(SSA) -

8: TXD +.

9: TXD -.

-The list of the pins do not match and I see names of different signals on both interfaces.

Am I right assuming that I should only make the following connections:

USB485 NOR to the climate Chamber ESPEC

1                       5, 6

2 not connected

3 not connected

4                       3

5                       4

6 not connected

7 not connected

8                       1

9                       2

Is there some special things I need to do in SW for this configuration to work? I'm using LabVIEW as my programming language to try to control the climate Chamber.

I especially do not know how I need to put in place the transmitter/receiver mode for all either works...

ESPEC documentation, I found that the communication system used is 'synchronized Modulation (four sons, half duplex).

Thank you 1 million for all of your helpful comments!

K.

You connected Rx to Rx and Tx of Tx.

You must connect Tx Rx and Tx Rx. In this way, you create a four-wire interface. Also, you must set your Board of Directors (MAXIMUM) 4-wire.

To make it perfect, you should also connect a 120 Ohm resistor at each end of the balanced line. So in total 4 resistors.

If you want I can draw you a picture to replace these (1 k) words.

Kees

Tags: NI Hardware

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