ICP DAS USA I-7521 User Manual page 140

Application 8: Multiplex Control (Master type)
 Refer to Applications 1 and 2 for more information
 The onboard DO of the I-7521 module can directly drive a relay. The
onboard DI can be linked to photo sensors to allow for event triggering.
The I-7521+DN-PR4 can be triggered by a photo-sensor and can control
the multiplex to select the expected analog signal
 All control operations are performed in the I-7521 module. The Host PC
is able to read the 3-channel A/D signals without requiring the multiplex
control
 Refer to the 7521ODM4.c file for the source code of the firmware
RS-232
I-7521/I-7522/I-7522A/I-7523/I-7524/I-7527 User's Manual,Ver2.5 Aug.2015
I-7520
I-7521
photo sensor
(#01)
D/I
RS-232
device
DN-PR4
A/I
RS-485
photo sensor
D/O
I-7521
(#AA)
D/I
RS-232
D/O
device
DN-PR4
A/I
140