Advantech PCI-1220U, User Manual, Page: 23 / 56

17 Chapter 3
3.3 Output Pulse Definition
The output pulse command of PCI-1220U is from MCX312 chip. The
pulse command has two types. One is in Up/Down mode and another is in
Pulse/Direction mode. While nP+P is differential from nP+N and
nP-P is differential from nP-N. After system reset, the nP+P and nP-P is
low level, and this invert output (nP+N, nP-N) is high level, and the
de-fault setting of pulse output mode is Up/Down. User can change the
output mode into Pulse/Direction mode by writing specified command
system register.
Figure 3.3: Output Signal Loop for Drive Pulses
From the circuit shown above (Figure 3-3), the default output mode is dif-
ferential output. For single ended output use, user can change jumpers
JP1~4 to +5V. Note that you should prevent from the noise interference
when using jumpers JP1~4 to output in5V to external device.
The following figure 3-4 and 3-5 show the examples of input circuitry
connection for both photo coupler and motor driver respectively.
Table 3.4: JP1~4 Jumpers
Jumper JP1 JP2 JP3 JP4
Output Signal XP+P XP-P YP+P YP-P
IC Output (Line Drive Output) Pin2 and Pin3 short (Default)
+5V Output Pin1 and Pin2 short