COM ports have properties that establish how the communication between the two devices will occur. Generally, both of the devices need to have the same settings. The COM port properties include
- Baud rate: Baud is the speed at which the port communicates with other devices. This number is in bits per second (bps): the bigger the number, the faster the speed.
- Data bits: This is the number of data bits that are transferred for each character, typically 7 or 8.
- Parity: This is a form of error checking that ensures the integrity of transferred data.
- Stop bits: This is how many bits follow a character and mark the end of a data transmission.
- Flow control: Sometimes called handshaking, this is a way for one device to stop another device from sending data until it’s ready to receive the data.
Although you can set COM properties in Device Manager, I recommend making changes in the program that you’re using to interface with the GPS receiver. You’ll usually see an Options or Configuration menu in the program that displays a dialog box where you can set these values.
COM ports have properties that establish how the communication between the two devices will occur. Generally, both of the devices need to have the same settings. The COM port properties include
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