User's Manual
Table Of Contents
- IMPORTANT NOTICE
- RESTRICTIONS ON USE
- PRODUCT CONFORMITY
- WARRANTY AND SAFETY INSTRUCTIONS
- TABLE OF CONTENTS
- INTRODUCTION
- 1 TECHNICAL SPECIFICATIONS
- 2 OPERATING VOLTAGE
- 3 SERIAL INTERFACE
- 4 USER INTERFACE
- 5 RF INTERFACE
- 5.1 Transmitter
- 5.2 Receiver
- 5.3 Priority RX/TX
- 5.4 Error correction
- 5.5 Error checking
- 5.6 User data whitening
- 5.7 Pacific Crest and TRIMTALK compatibility
- 6 TRANSPARENT DATA TRANSMISSION
- 7 SETTINGS
- 8 SW-RELATED COMMANDS AND OPTIONS
- 9 ACCESSORIES
- 10 APPENDIX A
- 11 APPENDIX B
SATELLINE-M3-TR1
User Guide, Version 3.0
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2) Data on channel
CD will switch to active state only after recognition of a valid data transmission. CD will not
react to interference signals.
3) Always 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) Ignored
RTS-line status is ignored.
2) Flow 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) Reception 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 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 than the speed of the radio interface, the internal transmit buffer memory cannot
overflow. However, when the serial interface speed exceeds the speed of the radio interface,
data will eventually fill transmit buffer memory. In this instance, it will take a moment after the