Technical data

Seite 13
5.1.4 Display of a radio link
As soon as a radio-modem-link is established, the function of the field strength display will
be deactivated. The modem-link is displayed via the LEDs:
LED3: on
LED2: off
LED1: blinks
5.1.5 Backup
For a backup via the radio path, the protocols RLP (Radio Link Protocol) or V.42bis are
taken. The use as well as the backup via the net-fixed line between net operator and control
station are dependant on the net operator and on the control station (Adjustment with or
without V.42bis).
5.1.6 Data format – Adjustment of the interface
In the ComuCont Dual, data format via the radio path is pre-fixed
to 8 data bits, no parity and 1 Stop bit.
The interface to the data terminal (terminal multiplexer) can be adjusted via PARACOM.
If transparent transmission is desired, the adjustment of 8 data bits, no parity and 1 stop
bis has to be selected via PARACOM. Thus, a device sending e. g. on 7 data bits, even
parity and on 1 stop bit, the parity bit will be jointly transferred (Exception 11bit
transmission).
5.2 Additional functions
5.2.1 Restriction of call acception (Time slot)
The restriction of call acceptance can be activated completely or for a certain period per day
(time from – to).
5.2.2 Code protection against unauthorized access on terminals
By entering a 8 digit code, the unauthorized access on the connected data terminals can be
protected against. This code is equivalent to the ComuCont Dual – ID.
If this protection is active, the code is queried in case of a call acception. Only if this code
is entered correctly, circuit switch to the data terminal is possible.
NOTE! This protection is only effective, if a code for parameterization of the device was
entered, too. Otherwise this code can be read.
5.2.3 Selection of the net operator
Reguarly, indication of the net operator is not necessary. Only in areas where several net
operators are located (threshold areas), this indication could be necessary. Normally, the
radio-module automatically selects the net operator in the region that indicates the highest
signal power. In the ComuCont Dual, it is optionally possible to indicate a net operator
permanently or preferentially, also if the signal power is lower. If the net operator is
indicated permanently, the device only logs into this net, i.e. in case that the signal power
of the net operator is too low, login into the net is disabled. In this case the device is not
reachable! In case that the net operator is indicated preferentially, but the signal of which is
too low, the device logs into an external net. Approx. every 14 minutes the system checks
wether the device logged into the net of the preferential net operator or if this net is
generally available.
5.2.4 Automatic recall
Automatic recalls can be initiated in certain intervalls. The following intervals are available
 daily
 weekly - on a certain day of the week
 monthly – on a certain day of the month.
The recall is passed through a control station parameterized in the device. If the link is not
established sucessfully (e.g. busy) the number of the next register is selected.