Line Trigger Input
For line-scan applications using a hardware acquisition line trigger, anyone or some pairs of the system I/O input ports can be selected as the source(s) for the line trigger control circuit of the acquisition channel.
For that usage, use the parameters belonging to the Encoder Control category.
The line trigger signal can be elaborated from one or two external signals provided by one of the following type of devices:
- Through one pair of high-speed differential input ports driven by an RS-422 compatible dual output phase quadrature incremental motion encoder.
- Through one pair of isolated current-sense input ports driven by a dual output phase quadrature incremental motion encoder that is not RS-422 compliant.
- Through a single high-speed differential input port driven by an RS-422 compatible single output incremental motion encoder or a similar device. This can be a dual output type of incremental motion encoder for which only one output signal is connected.
- Through a single isolated current-sense input port driven by an incremental motion encoder or a similar device that is not RS-422 compliant.
Possible ports assignments for each case
Sourcing device type |
Default port(s) assignment |
Alternate port assignment(s) |
RS-422 compatible dual output phase quadrature incremental motion encoder |
High-speed diff. inputs #1 and #2 |
- |
Other dual output phase quadrature incremental motion encoder |
Isolated input #1 and #2 |
Isolated input #3 and #4 |
RS-422 compatible single output incremental motion encoder or similar device |
High-speed diff. input #1 |
High-speed diff. input #2 |
Single output incremental motion encoder or similar device |
Isolated input #1 |
Isolated input #2 |
- Any input port and hence any electrical style can be specified for that function.
- The default port assignment for both single signal electrical styles is different of the one of the trigger.