Biostar M7VKH M7VKH user's manual - Page 24

Serial Ports/COM Ports

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Chapter 1 Motherboard Description signals to initiate communication. If you encounter a communication problem that cannot be resolved using a null modem, it can generally be assumed that one device is using the initialization signals and the other device is not. This can usually be resolved by wiring the RTS, CTS, and DCD pins together. Serial Ports/COM Ports The two serial ports on the computer are called COM1 and COM2 (optional), respectively. If you wish, two more serial ports can be added onto the computer using optional hardware. Should you choose to add the extra Serial ports (COM ports) they would be called COM3 and COM4. When using serial ports to communicate with a peripheral device, be sure to assign only one COM port number to each device. For example, if a printer and a scanner are both connected to your computer through serial ports, the printer must be assigned one COM port (i.e. COM1) and the scanner must be assigned the other COM port (i.e. COM2). No two devices can be assigned to one COM port. Each peripheral must have its own COM port. NOTE: Four serial ports may be installed on the computer. However, no more than two ports can be used simultaneously. *If you have installed an internal modem, be careful not to assign a COM port number that has already been assigned to another device. This error is common. When installing a device that is going to require the use of a serial port, use a diagnostic program to find out which ports are available. It may be necessary to remove expansion cards that have serial ports in order to check their jumper settings. The jumper settings will indicate which COM port the card has been assigned. Checking the expansion card will eliminate mistakes in overlapping COM ports. Once you have completed the installation of peripheral devices using the serial ports, be sure that the communication parameters such as baud rate, parity bit, etc. are matching. If your computer is set for a baud rate of 9600 and your modem is set for a baud rate of 2400 you will not be able to send messages. The manuals that accompany the peripheral devices will inform you on the procedure for setting their parameters. Software manuals also have instructions on setting parameters. 1-19

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Chapter 1
Motherboard Description
1-19
signals to initiate communication. If you encounter a communication problem that
cannot be resolved using a null modem, it can generally be assumed that one device
is using the initialization signals and the other device is not. This can usually be
resolved by wiring the RTS, CTS, and DCD pins together.
Serial Ports/COM Ports
The two serial ports on the computer are called COM1 and COM2 (optional),
respectively. If you wish, two more serial ports can be added onto the computer
using optional hardware. Should you choose to add the extra Serial ports (COM
ports) they would be called COM3 and COM4.
When using serial ports to communicate with a peripheral device, be sure to assign
only one COM port number to each device. For example, if a printer and a scanner
are both connected to your computer through serial ports, the printer must be
assigned one COM port (i.e. COM1) and the scanner must be assigned the other
COM port (i.e. COM2). No two devices can be assigned to one COM port. Each
peripheral must have its own COM port.
NOTE: Four serial ports may be installed on the computer. However, no more than
two ports can be used simultaneously.
*If you have installed an internal modem, be careful not to assign a COM port
number that has already been assigned to another device. This error is common.
When installing a device that is going to require the use of a serial port, use a
diagnostic program to find out which ports are available. It may be necessary to
remove expansion cards that have serial ports in order to check their jumper
settings. The jumper settings will indicate which COM port the card has been
assigned. Checking the expansion card will eliminate mistakes in overlapping COM
ports. Once you have completed the installation of peripheral devices using the
serial ports, be sure that the communication parameters such as baud rate, parity bit,
etc. are matching. If your computer is set for a baud rate of 9600 and your modem
is set for a baud rate of 2400 you will not be able to send messages. The manuals
that accompany the peripheral devices will inform you on the procedure for setting
their parameters. Software manuals also have instructions on setting parameters.