Siemens FS720 - Page 76

RS485 module (isolated) FCA2002-A1
76
Building Technologies A6V10210410_a_en_--
Fire Safety & Security Products 18.05.2009
3
4
X2
RS485_B
RS485_A
T1
Tn
2
1
*)
A
B
T1 First participant Tn Last participant
Comments
*) Stub lines must not exceed 20 m!
z Consider the polarity A, B!
z Terminate the line after the last participant (Tn) with 120 Ω!