Ports
CH0 to CH5 ports
Mode setting and local ID setting is performed by the CH0 to CH5 ports with the external dip switches or
jumpers.
An equivalent circuit to the ports is shown in the illustration below, and as the port is pulled up with resister,
the switches must be connected to the GND.
A latch-up is triggered if more than 2.7V of voltage is applied to the ports, and this may result in damage to the
device.
OPEN :H
CLOSE:L
CH0 - 5
LE ports
(1) Setting switches
Connect the setting switch to the LE (10 pin) terminal.
An equivalent circuit to the ports is shown in the illustration below, and as the port is pulled up with resister,
the switch must be connected to the GND.
The setting switch can only be pressed when the power supply is switched on. A communications error will
occur if the switch is pressed during normal operations.
(2) Status output
Verify the setting mode operations for the LD and LE ports. The STD-402 is not equipped with LEDs.
Connect the ports to the LED drive circuit or the CPU input port. The LED cannot be driven directly with this
port.
Setting switch
LE port
LE
LED
CPU port
LD port
Verify the setting mode operations for the LD and LE ports. The STD-402 is not equipped with LEDs.
Connect the ports to the LED drive circuit or the CPU input port. The LED cannot be driven directly with this
port.
LD port
LED
CPU port
