Siemens FS720 Mounting & Installation page 194

Installing, exchanging and connecting modules
7
RS232 / RS485 module
7.19.2.2 X2 on RS485 module
194 | 248
Building Technologies
Fire Safety
Pin Designation
4 RS485_A
3 RS485_B
2
1
Admissible cable cross-section: 0.2...1.5 mm²
X2
RS485_A A
B
RS485_B
T1 First participant
Tn Last participant
*) Stub lines must not exceed 20 m!
● Consider the polarity A, B!
● Terminate the line after the last participant (Tn) with 120 Ω!
Description
Line A
Line B
Not connected
Not connected
4
Tn
3
2
*)
1
T1
A6V10210390_m_en_--
2018-08-29