HyperTerminal is a program included in Windows. You can find it in menu Start > All programs > Accessories > Communication.
For connection to the gateway using COM port you should set following parameters:
- Bitrate set to 57600
- Flow control set to none
- Rest of values will stay default
Second option is to use TCP/IP connection. When you use TCP/IP, you have to use port 23 for the communication with the gateway.