Step 4: Null modem interface

Picture of Null modem interface
RS232 to RS232.

You can get null modem adaptors readily made so you do not have to make one. I have left the specifications in case you want to make your own or you do have access to the parts, but not the ready made adaptors. A null modem is  a way to interface two serial ports so that they can talk to each other. This sometimes known as a hard wired connection, See also

Note: if you are unsure about the connections, then get a professional to help. I will not be responsible for any issues. Also some devices use non-standard rs232 pin outs. you have to check the documentation for each device to make sure.

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