Operating instructions

5. Installation MICRO PANEL XV-102 3.5"
34 M002869-02, 07/2009
5.3.9 RS485
The RS485 interface complies with the EIA/TIA-485 standard. This interface is not electrically isolated.
Tab. 16 Pin assignment of the RS485 interface
Wiring Shielded twisted pair cables must be used.
Tab. 17 Cable specifications
Fig. 15 RS485 interface (9-pin, D-Sub, female, UNC)
Pin Signal Assignment
1- nc
2- nc
3 A EIA RS 485 line A
4- nc
5 GND Reference ground
6- nc
7 B EIA RS 485 line B
8- nc
9- nc
!
nc: Pins 1, 2, 4, 6, 8 and 9 must not be connected!
1
23
45
6
7
89
Cable specifications
Rated surge impedance 120 Ω
Permissible surge impedance 108…132 Ω
Max. cable length 1200 m
Possible baud rates 9600 Bit/s
19200 Bit/s
38400 Bit/s
57600 Bit/s
115200 Bit/s
!
When preparing the cables, ensure that there is a low-resistance connection between
the cable shield and the connector casing (→ Chapter 5.3.2, "
""
" 23).