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4.5
Sending and Receiving data in different flow controls
4.5.1 Flow control set to hardware Flow Control
4.5.1.1 Sending Data
When data is being sent by the D15, the only dynamic signals through the data transfer are TXD
and CTS. The DTE device should keep DTR & RTS ON.
TXD is used in order to transmit the data from the terminal to the D15, and CTS is used in order
to control the data flow. When data is being transferred too rapidly to the modem, in a rate greater
then its transfer rate, and its buffers become full, the modem sets CTS inactive high, until he
accomplishes the transfer.
When the modem is ready to accept more data, it sets the CTS signal active low again.
d15 Modem Integration and Application Developers Guide version draft 0.53
Figure 25 – D15 Receiving a data call
Figure 26 – D15 sending data HW flow control
Page 49 of 181
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