Data Flow Control (Handshake); Hardware Data Flow Control (Rts/Cts) - insys icom GSM 4.3 Manual

Table of Contents

INSYS GSM 4.3

12.6

Data Flow Control (Handshake)

The data flow control ensures that the data transfer is interrupted as soon as the

modem buffer exceeds a certain level. Two data flow control options are available:

Via the control lines RTS and CTS, or via the control characters XON/XOFF which

are inserted into the data stream.

12.6.1

The hardware data flow control works in two directions. When the critical buffer

level is exceeded, the modem will set the CTS line to "low" and will thus indicate to

the application to interrupt the data flow. When the buffer is emptied sufficiently

for the INSYS GSM 4.3 to be able to receive data again, the CTS line is set to

"high". Reversely, the application can also indicate to the INSYS GSM 4.3 to inter-

rupt the data flow. This is done via the RTS line. If it is set to "low", the modem will

interrupt the data flow to the application. The application will set it to "high" to re-

quest data from the INSYS GSM 4.3.

The data flow control with RTS/CTS behaviour is active by default.

Configuration with HSComm

Select the type of data flow control or switch it off completely on the

"Basic Settings" tab in the "Handshake" panel.

Configuration with AT commands

To switch the data flow control on and to

set the type to RTS/CTS, use

To switch the data flow control off, use

AT\Q3

AT\Q0

Functions

Table of Contents