Making a host target setup to work can be a challenge. Both components, hardware and software, must function properly.
There are several options of how target and host machines can be connected:
1) Using Serial Cable (null modem cable or RS-232)
2) Using USB cable
3) Using IEEE 1394 cable
Both USB and IEEE 1394 are much faster options than a regular serial cable. However, there are several disadvantages of using them . First of all, using a serial cable for a host target setup is less confusing. Needless to say that serial cable is a lot cheaper then USB or IEEE cable. For example, the price for USB debugging cable is around 80$ which makes a big difference if we compare this price to a 10$ null cable.
Before you start connecting your machines, you might want to check that COM ports are enabled in BIOS on both host and target machines. Also, make sure that Windows recognizes at least one COM port.