Rts-Line; Timing And Delays During Data Transmission; Data Buffering In The Radio Data Modem - Satel SATELLINE-EASy User Manual

SATELLINE-EASy
User Guide, Version 2.3
2) D D ata on channel
CD will switch to active state only after recognition of a valid data transmission. CD will not react
to interference signals.
3) A A lways ON
CD is always in the active state. This option can be used with terminal equipment, which use the
CD-line as an indicator of an active connection (the radio modem can transmit and receive at
any time).

6.2.3 RTS-line

The options for RTS-line are:
1) I I gnored
RTS-line status is ignored.
2) F F low control
The radio modem transmits data to the terminal device only when the RTS-line is active. Non-
active state of the RTS-line will force the radio modem to buffer the received data. This option is
used if the terminal device is too slow to handle data received from the radio modem.
3) R R eception control
RTS-line controls the reception process of the radio modem. An active RTS-line enables reception
(as normal). Non-active RTS-line will interrupt reception process immediately, even if the radio
modem is receiving a data packet. This option is used to force the radio modem into WAIT State
for an immediate channel change.

6.3 Timing and delays during data transmission

When using a radio modem for data transmission, certain delays will be formed through the use
of a radio interface and from the radio modem circuitry itself. These delays exist when the radio
modem switches from Standby Mode to Data Transfer Mode and during reception and
transmission of data. For detailed delay values in each case see Appendix B.

6.3.1 Data buffering in the radio data modem

Whenever the radio modem is in Data Transfer Mode it monitors both the radio channel and the
serial interface. When the terminal device starts data transmission the radio modem switches to
transmission mode. At the beginning of each transmission a synchronisation signal is transmitted
and this signal is detected by another radio modem, which then switches into receive mode.
During the transmission of the synchronisation signal the radio modem buffers data into its
memory. Transmission ends when a pause is detected in the data sent by the terminal device, and
after all buffered data has been transmitted. When the serial interface speed is the same or slower
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