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RS232 Colours

Good morning. It's nice to see the Milton fans are up and around during Lent.

Use this link and an ohmmeter to help you determine the relationship between DB-9 or DB-25 pins and their RS-232 function:

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Here's what they have to say (formatted in fixed font):

DB-9 Pin Corresponding DB-25 Pin Signal Function 2 3 RD Received data 3 2 TD Transmitted data 8 5 CTS Clear to send 7 4 RTS Request to send 6 6 DSR Data set ready 5 7 SG Signal ground 4 20 DTR Data terminal ready 1 8 DCD Data carrier detect

I wouldn't rely on wire insulation colors.

"[He] who overcomes lice By force hath overcome but half his foe; He must get the nits, too." ;-)

Chris

Reply to
Chris
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There are no color standards for RS-232 wiring, you have to go by the pin position. For DB-9 connectors its

1 NC 2 RXD 3 TXD 4 DTR 5 GND 6 DSR 7 RTS 8 CTS 9 NC 
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Rich Webb   Norfolk, VA
Reply to
Rich Webb

Hi all,

I have a RS232 connector which only has 4 wires (ripped from an old mouse)

The wires have been colour and text labeled:

RT - White V - Blue RX - Orange G - Green

IIRC from a cable wiring guide, RT = pinout 3 (transmit) V = 7 (RTS) RX = 2 (Receive) and G = 5 (ground)

Have I got the pinouts right? The colour of the wires are a bit confusing.

Thanks

Reply to
Parasites Lost

He's correct, the wiring color code is not defined for RS232

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