MC672/MC672A INPUT/OUTPUT BOARD
6
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Power Supply (J1)
The device requests a DC power supply and connect to J1.
DC: 12
–
30 V 10W
Fuse: F1, 2A
J1
Description
1
V+
2
GND
Reset
The device reset and set default output state at power-up, the state of the outputs does not change
even a system software or hardware reset (Watchdog Timer - WDT) may occur.
There is no any reset button on the device, Watchdog Timer (WDT) has been installed in the device.
Communication Interface (J2, JP3, JP4, JP5)
The device built in opto-isolated RS485 interface and the connector is J2, the baud rate can be
software configured.
J2 Pin
Description
1
NC
2
T/R +
3
T/R -
There are three jumpers used on the device for interface configuration, they are Jumpers J3, J4, J5
which are used to insert the termination resistors which may be required for the RS485 interface,
described in Table and Figure below.
Note: Termination resistance must be enabled across the data lines at circuit end-points.
Jumper
Short/Open
Description
Short
(default)
Enable pull-on resistance
JP3
Open
Disable pull-on resistance
Short
(default)
Enable pull-down resistance
JP5
Open
Disable pull-down resistance
Short
Enable termination resistance
JP4
Open
(default)
Disable termination resistance
