User`s manual

INSTALLATION

Configuring the CPU Frequency

The CPU card does not provide DIP switches to configure the processor

speed (CPU frequency). However, processors in the market today are

available with the CPU frequency fixed at a certain speed and cannot be

changed.

JP1, JP2, JP3: RS232/422/485 (COM2) Selection

COM1 is fixed for RS-232 use only.

COM2 is selectable for RS232, RS-422 and RS-485.

The following table describes the jumper settings for COM2 selection.

COM2

Function

RS-232 RS-422 RS-485

Jumper

Setting

(pin closed)

JP1:

1-2

JP2:

3-5 & 4-6

JP3:

3-5 & 4-6

JP1:

3-4

JP2:

1-3 & 2-4

JP3:

1-3 & 2-4

JP1:

5-6

JP2:

1-3 & 2-4

JP3:

1-3 & 2-4

JP4: Realtek RTL8139C LAN Enable/Disable

Use JP4, a 3-pin header, to enable or disable the on board Realtek

RTL8139C Ethernet controller.

JP4 Setting Function

Short/Closed

Enabled

Open

Disabled