Attachment Parameters
- Communication Port
- Select the number of the communications port though which your async connection will be established. The choices are COM1, COM2, COM3, and COM4. The default is COM1.
- Line Speed (bps)
- Line speed is the data transmission speed in bits per second.
If you have a 14,400 or 28,800 baud modem, its use of V.42bis compression technology allows you to take advantage of the highest speeds that your system supports. For a 14,400 baud modem, select a line speed of 57,600 or lower; for a 28,800 baud modem, select 115,200 or lower.
If you are not successful with these high speeds, you may need to select a lower line speed. For example, if your COM port does not have a FIFO buffer, you might need to select a lower speed. When a connection attempt fails or is not reliable at a higher speed, try a lower speed.
The default speed is 9600 bps.
The maximum usable speed depends on the capability of the processor or the communication port. If your connection fails, try a slow speed.
If you use the 8250 UART, your line speed should not be higher than 19,200 bps.
- Data Bits
- Select the number of bits that constitute a character, either 7 or 8. Your choice should match the value your ASCII host uses. The default is 8.
- Parity
- Parity is a method for detecting transmission errors. An extra
bit is appended to some unit of data, usually a byte. That bit is
set to 0 or 1, making the total number of 1 bits an even number (for
even parity) or an odd number (for odd parity). The valid parity type
is None, Odd, Even, Space, or Mark. None means that no parity bit
is sent or expected. Mark and Space mean that the parity position
is always set to 1 or 0, respectively, and that received parity is
not checked.
Select the same parity used on your remote system.
The default is None.
- Stop Bits
- One or two stop bits signify the end of each asynchronously-transmitted character. Select the same value, 1 or 2, as used by your remote system. The number of stop bits in use may depend upon the line speed. The default is 1.