SVS-Vistek SHR 10GigE, Manual

Page: 86 / 103

5.3.8 Serial data interfaces
(ANSI EIA/) TIA-232-F
RS-232 and RS-422 (from EIA, read as Radio Sector or commonly as Recom-
mended Standard) are technical standards to specify electrical characteristics of
digital signaling circuits. Serial connection might be used to control SVCams.
These signals are used to send low-power data signals to control exposure, light
or lenses (MFT). Usage scenario is a control possibility without network. Be
aware of low connection speed.
Serial interface parameter RS-232 RS-422
Maximum open-circuit voltage ±25 V ±6 V
Max differential voltage 25 V 10 V
Min. signal range ±3 V 2 V
Max. signal range ±15V 10 V
Table: 5-5: Serial interface parameters – RS-232 and RS-422
INFO See your camera data sheet regarding its serial capabilities.
Data transport is always asynchronous. Synchronization is implemented by fist
and last bit of a package. Data rate (bits per second) must be defined before trans-
mission.
RS232
RS232 is split into 2 lines receiving and transferring data.
l
RXD: receive data
l
TXD: transmit data
Signal voltage values are:
l
Low: -3 … -15 V
l
High: +3 … +15 V
INFO For restrictions, refer to table of serial interface parameter above.
Packaging data into containers (adding start and stop bits) is implemented by the
UART (Universal Asynchronous Receiver Transmitter).
Fig.: 5-38: UART encoding of a data stream
5 Feature description 86