IC-TW14 Datasheet, PDF (27/33 Pages) IC-Haus GmbH – IC-PMX Companion Chip

iC-TW14
iC-PMX Companion Chip
Rev A1, Page 27/33
Diagnostic Mode 1
Diagnostic mode 1 is used to measure the Wiegand
pulse angle, voltage, and magnetic field strength when
a Wiegand pulse occurs. Diagnostic mode 1 is initiated
using the DIAG1 command (1). See MODE/CMD on
page 19 for more information. See Diagnostic Mode
1 on page 12 for information on the serial data packet
used by diagnostic mode 1.
Diagnostic mode 1 is most easily used via the Wiegand
Pulse Stream tab in the free iC-TW14 GUI software as
shown in Figure 7.
Figure 7: Typical Wiegand Pulse Data
See MAGNET ALIGNMENT AND AIRGAP in iC-PMX
application note 2 for more information on using diag-
nostic mode 1.
Care must be taken when using diagnostic mode 1
to ensure that the rotational speed of the magnet is
low enough that all pulses are measured. Since each
character in a serial packet uses 10 bits, there are 14
characters in each packet, and there are 2 Wiegand
pulses per revolution, the theoretical maximum speed
for using diagnostic mode 1 can be calculated as
9600 bits 1 char 1 packet 1 rev 60 sec
·
·
·
·
= 2057 RPM
sec 10 bits 14 chars 2 packets min
It is recommended to use a speed well below this value
for best results.