SATELLINE-EASy Pro 35W
User Guide v.1.4
35
Handshaking is not needed if the system protocol is designed to prevent collisions (data
contention) by the use of polling, or if there is little traffic and also if there is no harm from
occasional data contention situations (several radio modems try to transmit at the same time).
8.2.1
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.
8.2.2
CD-line
The CD handshaking options are not supported by SATELLINE-EASy Pro 35W modems.
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.
