Setting Up
4-49
9161-A2-GH30-20
September 1997
Table 4-9.
Communication Port Options (2 of 5)
Port Type
Possible Settings: Asynchronous, Synchronous
Default Setting: Asynchronous
Specifies whether the port transmits synchronous or asynchronous data.
Asynchronous – The port uses asynchronous communication.
Synchronous – The port uses synchronous communication. Synchronous is only valid
when Port Use is set to Net Link.
Clock Source
Possible Settings: Internal, External
Default Setting: Internal
Specifies whether the port uses internal or external clocking when the COM port is set
for synchronous transmission. For synchronous operation, the COM port is always
defined as a DCE. This configuration option reverses the direction of the clock (TXC,
and RXC) interchange circuits and allows the COM port to accept clocking from an
external device.
Connection to another DCE requires the use of a crossover cable.
Clock Source does not appear if Port Type is set to Asynchronous.
Internal – The COM port uses internal clocking.
External – The COM port uses external clocking.
Data Rate (Kbps)
Possible Settings: 9.6, 14.4, 19.2, 28.8, 38.4, 57.6, 115.2
Default Setting: 19.2
Specifies the bits per second rate for the COM port.
Data Rate (Kbps) does not appear if:
– Port Type is set to Synchronous and,
– Clock Source is set to External.
9.6 – Sets the COM port rate to 9600 bps.
14.4 – Sets the COM port rate to 14,400 bps.
19.2 – Sets the COM port rate to 19,200 bps.
28.8 – Sets the COM port rate to 28,800 bps. (Running above 28.8 may cause problems
on older PCs.)
38.4 – Sets the COM port rate to 38,400 bps.
CAUTION: The following speeds (57.6 and 115.2 Kbps) are intended to be used for
FTP file transfers only. If you configure one of these rates, be sure to
use the standard 14
′
COM port cable or an equivalent short, low
capacitance cable.
57.6 – Sets the COM port rate to 57,600 bps.
115.2 – Sets the COM port rate to 115,200 bps.
