What is the schematic of an RS232 Null-Modem?

To connect the receiver Ferguson with a computer you need Rs232 Null-Modem cable. It is a cable female-to-female 'crossover' used for communication between two digital devices.

Such devices can be eg. A PC and a digital satellite tuner, two PCs, a network device such as a modem / router / switch and a PC.

The cable is suitable for communication between all devices with the I / O port connector DB9M, the so-called RS232 male.

Prepared cable you can buy or make yourself.

On both sides are used plug female DB-9.

The individual pins should be connected according to the diagram.

Note:

Part of receivers Ferguson has to connect RS232 connector mini-jack.

To connect the adapter will be required as shown below.

Adapter with USB to RS232

Additional practical note, if you encounter a problem with the operation of an adapter from USB to RS232. The cleanest problem is the lack of action and report on Windows error code 10.

In this situation, we recommend the solution described> here<