Hardware Flow Control; Table D-1: Summary Of Supported Flow Control Methods - PictureTel Concorde 4500 Servicing Manual

CONTROL AND DATA PORT COMMUNICATIONS
Method
Hardware
Clear to Send (CTS)
Data Terminal
Ready (DTR)
Software
Xon/Xoff

Hardware Flow Control

D-6

Table D-1: Summary of Supported Flow Control Methods

Control Asserted
By
Near-end device
Near end
Far end
Far-end device
Near end
Far end
Hardware ßow control uses modem control signals to stop and start
the ßow of data. The following Þgure illustrates the relationship
between hardware ßow control signals and the four devices that are
involved in synchronous communication: two Concorde¥4500
systems and two DTEs.
Condition
Nothing to send
RTS low
Buffer > 1/2 full
DTR low
Buffer > 1/2 full
Disabled by
Ignore Flow
Control?
Yes
No
Yes
No