EIA RS-232C Inputs - ARX...DRX
There are four EIA RS-232C input ports in cameras com connector. The ports are named ARX, BRX, CRX, and DRX.
EIA RS-232C Inputs
Each port has two pins named respectively xRX and GND; with x = {A, B, C, D}.
The port is a singled-ended I/O port. The "warm wire" of the transmission line carrying the signal has to be connected on the xRX pin; the "cold wire" of the transmission line has to be connected on any of the GND pins of the cameras com connector.
The port complies strictly with the specifications of EIA RS-232C standard.
DC Specifications
Parameter |
Min |
Typ. |
Max |
Units |
Input voltage operating range |
-25 |
|
25 |
V |
RS-232 input threshold low |
0.6 |
1.1 |
|
V |
RS-232 input threshold high |
1.4 |
2.4 |
|
V |
input resistance |
3 |
5 |
7 |
kΩ |