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10.1 Controller with RS-232 port
The system bus connection is located at the back of the controller housing (RJ-12 jack).
In this case, the controller can be connected either directly to the serial interface of a PC
(point-to-point connection) or to a (dial-up) modem. A dial-up modem is required if the control-
ler is to be connected to the telecommunications network. In this case, the controller works au-
tonomously and can issue an alarm call to the building control station when errors occur. Addi-
tionally, the building control station can dial up the controller, read data from it, and send new
data once the valid key number has been written to the holding register no. 40070.
On recognizing the key code from the controller as valid, the register value “1” confirms writing
permission. In any other case, the register value remains at “0”. Any further establishment of
communications requires the writing permission to be acquired by resending the key number.
Note!
If a wrong key number has been written to holding register no. 40070 for the third consecutive
time, the controller immediately interrupts the modem connection and sets the D6 bit of the error
status register (Unauthorized access). As a result, the call to the configured control system is
triggered and a text message/fax sent. Bit D6 is deleted as soon as the error status register has
been read by the control system and the connection has been terminated.
In special cases, the
Lock dial-up
function can be selected to stop dial-up in case an error oc-
curs. Using the
Dial-up also upon corrected error
function, the controller additionally informs
the building control station when a previously signaled error no longer persists.
Functions
WE
Configuration
Modbus
ON
Co9 -> Fb00 = ON
Modem function
OFF
Co9 -> Fb01 = ON
Modem dialing procedure
OFF
Co9 -> Fb02
Lock dial-up
OFF
Co9 -> Fb03
Modbus 16-bit addressing
OFF
Co9 -> Fb04
Dial-up also upon corrected fault
OFF
Co9 -> Fb00
Parameters
*
WE
Parameter level / Range of values
Station address (ST.-NR)
255
PA9 / 1 to 247 (with Fb04 = ON: 1 to 999)
Baud rate (BAUD)
9600
PA9 / 300 to 19200
Cyclic initialization (I)
30 min PA9 / 0 to 255 min
Modem dial interval between calls (P)
5 min
PA9 / 1 to 255 min
EB 5474 EN
67
Communication
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