19
Appendix
Ⅰ
: RS 485 LINE
1.
RS485 Features
RS485 Industry Line is communication line of speciality impedance 120
Ω
, and
support 32 node at most, including controlling and controlled equipments.
2.
RS485 Transmission Distance
0.56mm(24AWG)twisted pair line as communication line
Baud Rate
Farthest Transmission
Distance
2400 Bps
1800m
4800 Bps
1200m
9600 Bps
800m
3. Connection and terminal resistance
RS485 industry line requires chain connection among all devices, and both ends
should be with 120
Ω
terminal resistance.
But” D” section should not exceed 7 m.
Connection of 120
Ω
resistance: this resistance has been ready on circuit board,
and default isthat it’s on 2~3, and 120
Ω
isn’t connected. When needs to connect to
120
Ω
, please replace it on 1~2 circuit.
Laser Dome Camera LD200/400 PTZ
www.laseroptronix.se