Verilink Productivity 500 (34-00236) Product Manual - Manual (Page 50)

Page 50 500 TA Option Configuration
Flow Control Options \Q
This command controls the flow of data when the 500 TA and the PC or termi-
nal are set to different asynchronous speeds or when using V.120 protocol in
asynchronous mode. If the DTE speed is faster than the 500 TA speed, flow
control will stop data transmission when the 500 TA buffers are full. When
buffer space becomes available, flow control indicates to the PC to resume
transmitting data. The opposite will happen if the 500 TA speed is faster than
the DTE speed.
The \Q1 command enables bidirectional XON/XOFF flow control. The 500 TA
sends an XOFF (DC3) character to the PC to stop data transmission and sends
an XON (DC1) character when transmitting can resume. The PC can also send
an XOFF character to tell the 500 TA to stop transmitting and an XON charac-
ter when transmitting can resume.
The \Q2 command enables unilateral CTS flow control. The 500 TA turns CTS
off causing the PC to stop transmitting and turns CTS on when the PC can
resume transmitting.
The \Q3 command enables bidirectional RTS/CTS flow control. The 500 TA
can turn CTS on and off, causing the PC to start and stop transmitting. The PC
or terminal can turn RTS on and off causing the 500 TA to start and stop trans-
mitting.
The \Q4 command enables unidirectional XON/OFF flow control. The 500 TA
sends an XOFF character to the PC or terminal to stop transmitting and sends
an XON character to resume transmitting.
Data Carrier Detect &C
This command controls the DCD output (pin 8) in asynchronous mode. There
are three choices: always on, normal, and always on except during disconnect.
Always On (default) - Use the &C command to force DCD to always be on.
Normal - Use the &C1 command to specify that DCD remains off until the 500
TA recognizes the remote unit's carrier signal and the rate adaption protocol (if
any) is established
Command Operation
\Q Flow control off
\Q1 DTE/DCE XON/XOFF flow control
\Q2 DTE CTS flow control
\Q3 DTE/DCE RTS/CTS flow control (default)
\Q4 DTE XON/XOFF flow control