SVS-Vistek HR Series, Manual

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SVS-VISTEK
Feature description 67
6.3.9 Serial data interfaces
(ANSI EIA/) TIA-232-F
RS-232 and RS-422 (from EIA, read as Radio Sector or commonly as
Recommended Standard) are technical standards to specify electrical
characteristics of digital signaling circuits.
In the SVCam’s these signals are used to send low-power data signals to
control light or lenses (MFT).
serial interface parameter – RS-232 and RS-422
RS-232
It is splitted into 2 lines receiving and transferring Data.
RXD receive data
TXD transmit data
Signal voltage values are:
low: -3 … -15 V
high: +3 … +15 V
With restrictions: refer to Table: serial interface parameter above.
Data transportis asynchronous. Synchronization is implemented by fist and
last bit of a package. Therefore the last bit can be longer, e.g. 1.5 or 2
times the bit duration). Datarate (bits per second) must be defined before
transmission.
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