RS232 vs. Parallel

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JohnJ

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Apr 24, 2001
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While working on a larger problem I found I was not quite sure of the port and cableling names. Is DB-25 RS232 the same as a Parallel port? Also, What is RS422 and RS485.

I know that DB-9 is RS232 and a serial port, so I assume that DB-25 RS232 is simiar to a serial port but I think I may be getting it mixed up with a standard Parallel port as well.

I had found one site but it was too technical for what I need to know. I just want to know an example of it's purpose and what type of connecter they use.

If someone could straighten me out on all this it would help me a lot.

[in case your wondering about the larger problem...it involves Punch Press machines, controls, and a BTR board. It seems most BTR's use a serial (DB9 RS232 connection) but ours uses what I am calling the parallel port]
 
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If I undertand correctly.

DB-25 is the type of cable/connector (25 pins) and has both male and female connectors. DB-9 is similar but with 9 pins.

RS232, 422, and 485 are the protocol being sent over that cable...
 

JohnWill

Retired Moderator
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Oct 19, 2002
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106,425
Actually, if you are looking at a computer that has both DB-9 and DB-25 connectors, there's an easy way to determine if they're serial or parallel ports. Serial ports are male connectors on the PC chassis, parallel ports are female connectors. Obviously, the mating cable has the opposite gender to connect to the machine. :)
 

JohnJ

Thread Starter
Joined
Apr 24, 2001
Messages
433
Ok. All that helps! Turns out I was correct in my thinking. The websites helped a little too.

[it is the parallel port and not an RS232 port]

Thank you
 
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