Compatible-systems 5.4 Manuel d'utilisateur télécharger pdf (Page 226)

220 Chapter 14 - General

Tx Clock Internal (Sync Only)

This parameter determines whether the interface will source a clock signal or

expect to receive an external clock.

• If checked, the interface will expect to source a clock, and will ignore an

external clock signal.

• If unchecked, the interface will expect to receive an external clock. This

is the default setting.

v Note: In addition to this setting, some WAN interfaces require internal

hardware jumpers to be changed in order to source a clock signal. Check the

Installation Reference Guide for the device.

Baud Rate

This pull-down menu determines the speed of the port’s internal clock. In

Async operation, this value must match the baud rate of the external commu-

nications device. In Sync operation this value is ignored unless Tx Clock

Internal is checked, in which case it determines the speed of the clock which

is sourced.

Flow Control (Async Only)

This setting determines the type of flow control used on interfaces set for

Async operation.

• If none is selected, the interface will not pace the rate at which it sends

characters.

• If hardware is selected, the interface will use the state of the CTS (Clear

To Send) line to determine whether characters may be sent. This is the

default setting.

• If XOn/XOff is selected, the interface will trap XOn and XOff characters

to determine whether characters may be sent. This method is also known

as “software” flow control.

v Note: You may also need to configure your communications device

(through switch settings or internal registers) to run with software flow

control. Software flow control is not recommended at speeds above 9600

Baud.

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Compatible-systems 5.4 Manuel d'utilisateur Page 226