Transparent Data Transmission
Serial Interface, Data Format
14
SRL-35 Operator’s Manual P/N: 1003224-01
CTS-line
The options for CTS-line are:
1) Clear To Send
CTS is active when the radio modem is ready to accept data for new transmission.
CTS will shift into inactive state during data reception and transmission.
2) TX buffer state
CTS will shift into inactive state only if the radio modem’s TX buffer is in danger of
overflowing. This typically happens when the serial interface data transfer speed is greater than
the radio interface transfer speed and the size of transmitted messages is large.
CD-line
The CD handshaking options are not supported by the SRL-35 modem.
The options for CD-line are:
1) RSSI-threshold
CD is active whenever a signal with a level exceeding the level required for
reception exists on the radio channel. It doesn’t make any difference if the signal is an actual
data transmission, a signal of a radio transmitter not belonging to the system, or even an
interference signal caused for example, by a computer or a peripheral device. CD is also active
when the radio modem in question is transmitting.
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).
4) External Antenna Control
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. Radio Protocol Support
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