Basler raL2048-48gm User Manual download pdf (Page 150)

Acquisition Control AW00118302000

140 Basler racer GigE

8.6 The Shaft Encoder Module

The camera is equipped with a shaft encoder software module. The module can accept input from

a two channel shaft encoder (Phase A and Phase B). The module outputs a signal that can be used,

for example, as a source signal for the line start trigger function or the frame start trigger function in

the camera. Fig. 49 shows a typical implementation of the shaft encoder software module in the

camera.

Fig. 49: Typical Shaft Encoder Module Implementation

To use the shaft encoder module, you must select a source signal for the Phase A input and for the

Phase B input on the module. The allowed source signals for the Phase A and Phase B module

inputs are camera input line 1, camera input line 2, and camera input line 3. So, for example, you

could apply the Phase A signal from a shaft encoder to physical input line 1 of the camera and select

input line 1 as the source signal for the Phase A input to the module. And you could apply the Phase

B signal from a shaft encoder to physical input line 2 of the camera and select input line 2 as the

source signal for the Phase B input to the module. More information about selecting a source signal

for the module inputs appears in a code snippet later in this section.

Fig. 50 shows how the software module will interpret the input from the shaft encoder when the

encoder is connected as illustrated in Fig. 49. The software module will sense forward ticks from

the encoder when the input is as shown in the left part of Fig. 50. The software module will sense

reverse ticks from the encoder when the input is as shown in the right part of the Fig. 50.

Fig. 50: Software Module Direction Sensing

Shaft

Encoder

Camera

Phase A

Phase B

Input Line 1

Input Line 2

Phase A

Input

Phase B

Input

Shaft

Encoder

Software

Module

Output

Line Start

Trigger

Module output

selected as the

signal source for

the line start

trigger function

Input line 1

selected as the

signal source for

the Phase A input

Input line 2

selected as the

signal source for

the Phase B input

Phase A

Forward Ticks

Phase B

(Phase A leads Phase B, i.e., Phase B

low at rising edge of Phase A)

Phase A

Reverse Ticks

Phase B

(Phase B leads Phase A, i.e., Phase A

low at rising edge of Phase B)

Tick Tick Tick Tick Tick Tick Tick Tick

1 2 ... 145 146 147 148 149 150 151 152 153 154 155 ... 237 238

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Basler raL2048-48gm User Manual Page 150

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