Switch And Interface Assignments - Siemens CKA4820 Betriebsanleitung

Design of CKA4820
4.3

Switch and Interface Assignments

68
Siemens Building Technologies
Fire Safety & Security Products
The RS232 interface is switched to active via COM1A, and the TTY interface via
COM1B.
SW401 SW301
s. Table 2 s. Table 3
COM2
RS485 or
TTY
Fig. 5 Relationship between DIP switches and interfaces
1
RS232 interface OFF
TTY interface OFF
Tab. 2 Control unit interface COM1A/COM1B (SW401): interface selection
1
RS485 interface ON
without terminating
resistor *
RS485 interface ON
with terminating
resistor*
TTY interface OFF
Signal transmitter X
OFF
Signal transmitter X
ON
Tab. 3 Telemetry interface COM2 (SW301): interface selection, audible signal
transmitter
* The value of the terminating resistor for the RS485 interface is 120 Ω .
If the terminating resistor is switched to OFF, the value is ∞ .
X Any switch position.
no
function
COM1B
TTY or
2 3 4 5
ON OFF OFF ON
OFF ON OFF OFF
2 3 4 5
OFF ON OFF OFF
OFF ON OFF ON
ON OFF ON OFF
X X X X
X X X X
no
function
COM1A
RS232
6 7 8
OFF OFF OFF
ON OFF OFF
6 7 8
OFF OFF X
ON OFF X
OFF OFF X
X X OFF
X X ON
01.2005