Description Of Communication Parameters To Be Adjusted - Samson TROVIS 5474 Mounting And Operating Instructions

Communication

10.3 Description of communication parameters to be adjusted

Station address (ST.-NR)
This address is used to identify the controller in bus or modem mode. In a system, each control-
ler needs to be assigned a unique address.
Baud rate (BAUD)
In a bus system, baud rate refers to the transfer speed between control system and controller. In
modem mode, baud rate refers to the transfer speed between controller and modem.
The baud rate adjusted at the controller must correspond with the baud rate of the control sys-
tem, otherwise no communication can be established.
Cyclical initialization (I)
This parameter defines the period of time for a cyclical issue of the initialization command
"ATZ". The command is not issued during dial-up or when connected. "ATZ" causes the pro-
file 0 to be copied to the active profile, provided the modem parameters have been set and
saved in profile 0 using a suitable terminal program.
Typical initialization of a modem with a terminal program:
AT & F (restores modem to its factory settings)
OK (response of the modem)
ATEOSO = 1 (command input, EO: echo off;
SO = 1: answer on first ring)
Dialing pause (P)
It is recommendable to pause for approx. 3 to 5 minutes between dialing up to the control sys-
tem to avoid a permanent overloading of the telecommunications network. The Dialing pause
defines the interval between 2 dialing attempts.
Modem time-out (t)
When the controller connects to the control station but without addressing a Modbus data point,
the connection is closed after the time specified for Modem time-out has elapsed. If the error sta-
tus register has not been read during the control station connection, the controller dials up to the
control station again after the Dialing pause (P) has elapsed.
Number of redialing attempts (C)
The controller tries to dial up to the control system again, observing the Dialing pause , in case
the control station is busy or the function that triggered the call has not been reset by the control-
ler. After the specified number of redialing attempts have failed, the controller dials the alterna-
tive recipient.
Reset the function that triggered the call = Polling the error status register (HR 40060)
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