Remote Control
Page 18
4.2.3.1 "None" Flow Control
In most cases, there is no need for flow control because of the simplicity of the DLS 50.
The "None" flow control selection can be a valid choice if only one command at a time
is sent with some delay between them.
4.2.3.2 CTS Flow Control
When CTS flow control is selected, the DLS 50 lowers the CTS and the DSR lines when
it cannot accept data, and raises them when it can accept new characters.
This protocol controls the data flow in only one direction; from the computer to the DLS
50.
4.2.3.3 RTS/CTS Flow Control
When RTS/CTS flow control is selected, the DLS 50 stops transmitting data when the
RTS line is low, and restarts when the RTS line is high. The DLS 50 lowers the CTS
and the DSR lines when it cannot accept data, and raise them when it can.
This protocols controls the data flow in both directions. Note that the RTS line is not
the usual "Request To Send" as defined by the RS-232 standard.
4.2.3.4 XOn/XOff Flow Control
When XOn/XOff flow control is selected, the DLS 50 stops transmitting data when it
receives the XOff character (decimal 19, hex 13, ^S), and restarts when it receives the
XOn character (decimal 17, hex 11, ASCII ^Q). The DLS 50 will send XOff when it
cannot accept data and will send XOn when it can.
This protocol controls the data flow in both directions.
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