Siemens TFT - Manual (Page 126)

Video Transmission
Accessories Video Transmission
7-4 © Siemens Building Technologies Group
Type Order No.
RS232-RS485 Converter RS232 to RS485
Converts RS232 interface signals to RS485 interface signals.
Weight 0.40 kg
2GF5505-8AH
RS232-TTY Converter RS232 to TTY
Converts RS232 interface signals to TTY interface signals.
Weight 0.37 kg
2GF5505-8AG
VGI200 Video Isolation Transformer
The VGI200 video isolation transformer breaks ground loops‚ only
allowing video and camera control signals through. Ground loops occur
when the earth potential at the camera is different from the potential
at the monitor. This difference may only be a small voltage but it can
cause large currents to flow through the shield of the coaxial cable.
These large currents will cause picture distortion and safety problems if
they remain.
Connections 2 x BNC‚ in and out
Impedance 75 Ohm
Housing Plastic
Weight 0.227 kg
GBQ:A5573460001
VT/75 VT/75-75 Video Transformer 75R
Achieves groundloop isolation on a video cable‚ i.e. removes earth
loops. VT75-75 D 75 ohm coax in / 75 ohm coax out. Compatible with
‘C’ type telemetry.
Dimensions (H x W x D) 41 x 32 x 90 mm
Weight 0.20 kg
BPZ:80-236