Functional Description
T1
As soon as the A2400 detects a character in the
T2
Once the RTS signal has been asserted, the T2 delay is activated. This is a delay time to allow the transmitter to power up and settle in anticipation of a transmission back to the host. The settling time required is specified by the modem manufacturer. When the T2 time period is over, the A2400 will start to transmit the data held in the receive buffer, and will continue to transmit until the buffer is empty.
Some radio modems provide a CTS (Clear To Send) signal that indicates that the transmitter has settled and is ready for data. This signal may be connected to the CTS input of the A2400 to provide hardware handshaking.
The delay period T2 ends when either the CTS signal is detected or the T2 timer ends, whichever comes first.
T3
The A2400 will transmit data to the modem until the receive buffer is empty. When the receive buffer is empty, and the last character has been transmit- ted, time delay T3 is activated. T3 provides two functions: it provides a clean break between the transmitted data and the
If T3 times out and the receive buffer is empty, the radio connection is terminated by turning off the RTS signal.