![opto engineering COE LS-X Series Скачать руководство пользователя страница 48](http://html.mh-extra.com/html/opto-engineering/coe-ls-x-series/coe-ls-x-series_user-manual_1643934048.webp)
V 1.0 - eng
48
COE LS-X Line Scan Camera | USER MANUAL
resistance should not be enabled on the bus structure, which will reduce signal reliability and may
cause damage to the RS-422 device.
⚫
RS-644 Standard Input
If the differential input adopts RS-644 standard signal, the input terminal must enable 120
Ω
terminal resistance.
⚫
TTL&LVTTL
Standard Input
If the differential input adopts
TTL&LVTTL
standard signal, the input terminal’s 120 Ω terminal
resistance must be disabled, and its input electrical feature requirement is shown below.
Table 1-15
Electrical Feature Requirement of TTL&LVTTL
Voltage
Description
0 V to 1 V
Level low
1 V to 3 V
Unstable voltage, and it is not recommended to use it.
3.3 V to 24 V
Level high
9.2.2 Differential Output Circuit
The internal circuit of differential output signal in I/O signals is shown below.
Figure 1-49
Internal Circuit of Differential output
The RS-422 standard and RS-644 standard are applied to the differential output.
⚫
RS-422 Standard Output
In order to make sure the normal operation of output circuit, it is required to connect camera’s
ground signal with external ground signal. The output interface can be connected to the RS-422
bus structure as a main dispenser.
⚫
RS-644 Standard Output
The camera adopting RS-422 standard output signal cannot directly connect to RS-644 standard.
When connecting RS-
644 standard output, it is required to add a resistance network in camera’s
output location. In order to make sure the normal operation of output circuit, it is required to connect
camera’s ground signal with external ground signal.
9.2.3 Bi-Direction I/O Circuit