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FLUKE744
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Join Date: Jul 2010
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Pin Out DB25 MODBUS

07/06/2010 12:02 PM
Dear Fellows,

Do you have the pin out DB25 connector for using in MODBUS protocol.
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ATC
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#1

Re: Pin Out DB25 MODBUS

07/07/2010 3:19 AM

CR4 ADMIN: Deleted Post #1

This post was deleted because it contained advertising outside the Commercial Space forum. Please review Section 14 of the CR4 Site FAQ about advertising.

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Doorman
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#3
In reply to #1

Re: Pin Out DB25 MODBUS

07/07/2010 12:05 PM

Hello ATC

A shameless attempt to drive traffic to your site. Not for long...

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MOURADIG
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#2

Re: Pin Out DB25 MODBUS

07/07/2010 11:32 AM

Try this link http://www.modbus.org/docs/Modbus_over_serial_line_V1.pdf

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ATC
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#4

Re: Pin Out DB25 MODBUS

07/07/2010 9:08 PM

CR4 ADMIN: Deleted Post #4

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Carl_E
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#5

Re: Pin Out DB25 MODBUS

07/08/2010 1:31 PM

Modbus is a protocol, it has no standardized wiring, because the wiring depends on the hardware comm link used to transport the protocol data.

A DB25 connector is commonly used as a serial RS-232 or a Centronics parallel printer. The shape of the connector does not define the hardware connected to it.

Assuming that it's an RS-232 port, a conventional standard pinout is available here
http://www.zytrax.com/tech/layer_1/cables/tech_rs232.htm#db25
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FLUKE744
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Join Date: Jul 2010
Posts: 9
#6

Re: Pin Out DB25 MODBUS

07/08/2010 1:42 PM

Thanks again Carl, the link it seems to be what I am looking for. I appreciated your help.

NOTES:

  • Leave any pins not specified above unconnected.
  • In balanced mode signals with the same name are the paired set, for example, pins 2 and 14 are both named BA and form the Transmit Data pair. Each signal of the pair is either a high (A+) or low (B-)
  • When used with RS-485 in half-duplex, multi-dropped environments a simple three signal arrangements is frequently used - one pin is used as a GND and RX/TX is alternately switched onto a balanced pair of wires which can be either the BA (TX) or BB (RX) pair.
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