Siemens FS720 Quick Reference For Components / Pin Assignment page 76

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