I/O Control of racer 2 L Cameras#
The GPIO lines are designed to accept RS-422 differential signals, but they can also be used with low voltage TTL signals. Each GPIO line can be configured to work as an input or as an output.
NOTICE: Applying incorrect electrical signals to the camera's GPIO line can severely damage the camera.
- Before you connect any external circuitry to the GPIO line, use the Line Mode feature to configure the line for input or output.
- Make sure to apply appropriate input or output signal voltages as specified below.
- Make sure the cable and plug you connect to the 12-pin receptacle follows the correct pin assignment. In particular, don't use a pin assignment that would be correct for Basler area scan cameras. The 12-pin receptacles of Basler line scan and area scan cameras are electrically incompatible.
Input Lines#
Using the Input Lines with RS-422#
The following diagram shows a typical circuit when each input line is designed to receive an RS-422 signal. For the camera’s I/O circuitry to operate properly, supply a ground as shown below. Enabling the 120 Ω termination resistor ensures signal integrity.
Using the Input Lines with LVTTL#
The following diagram shows a typical circuit when receiving an LVTTL (Low Voltage Transistor Transistor Logic) signal. For this purpose, the LVTTL signal must be applied to the positive (+) input pin of the camera. The termination resistor must be disabled.
Electrical Requirements#
The following voltage requirements apply to the camera’s I/O input (pin 4 in the example above) when using LVTTL.
| Voltage | Description |
|---|---|
| 0–5.0 VDC | Safe operating range. |
| 0–0.8 VDC | Indicates a logical 0. |
| >0.8–2.0 VDC | Region where the logic level transition occurs. The logical state is not defined in this region. |
| >2.0 VDC | Indicates a logical 1. |
| 6.0 VDC | Absolute maximum voltage. This voltage must never be exceeded. Doing so may damage the camera and voids the warranty. |
Output Lines#
Using the Output Lines with RS-422#
The following diagram shows a typical circuit when each output line is designed to transmit an RS-422 signal. For the camera’s I/O circuitry to operate properly, supply a ground as shown below.
Using the Output Lines with LVTTL#
The following diagram shows a typical circuit when transmitting an LVTTL signal. A low signal is indicated by a camera output voltage near zero, a high signal is indicated by an output voltage of approximately 3.3 VDC. These voltages are within the typically specified levels for low voltage TTL devices.
For the camera’s I/O circuitry to operate properly, supply a ground as shown below. The termination resistor must be disabled.
