Specifications

CDA70 MODEM DESCRIPTION
32
Parameter name
Set value
range
Parameter description
RF channel protocol
--- Information about used radio channel
protocol.
Relay station
YES/NO Indicates relay property of this station. Only
for automatic tables.
Mobile station
YES/NO When this parameter is set on YES, than this
modem never works as relay station and
sends data directly to destination stations (no
relay) regardless of signal levels. Mobile
station is intended for maintenance purposes
in network.
RF channel access
type
Collision/
Coll. Free
When this parameter is set to COLLISION,
than the modem listens on RF channel and
sends data only to free channel otherwise
waits. When this parameter is set on COLL.
FREE, than the modem send data
immediately.
RF channel access
protocol
--- Information about used radio channel access
protocol.
Transmit attempts
1 up to 5 The maximal number of data (one particular
message) transmission repetition.
Packet maximum
length
128 up to 2048
bytes
Maximal possible length of transmitted data
message; the maximal adjustable message
length is 2048 bytes.
RF transmit
synchronization length
1 up to 100 Number of characters in transmitted
synchronization sequence.
Time for RF chan.
occup. recognition
4 up to 50 msec Minimal time for busy channel detection. This
time is set in mili-seconds.
Fixed time for ACK
waiting
100 up to 1200
msec
Fixed part of time out in mili-seconds for ACK
(on previously sent data) waiting.
Module time for
random ACK waiting
100 up to 1200
msec
Variable part of time out in mili-seconds for
A
CK (on previously sent data) waiting. Value
added to fixed part randomly varies from 0 to
value of this parameter.