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Installation and Wiring
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AXC-232++ RS-232/422/485 Interface Card
Installation and Wiring
Setting the Internal Jumpers
The AXC-232++ can be used as an independent RS-232/422/485-controlled interface by setting the
internal jumpers (JP1 and JP2). FIG. 1 indicates the location of the jumpers on the card.
Setting jumper JP1 to terminate RS-422 input with 100 ohms
Terminating a device involves installing a 100 ohm line terminator. This is typically used to achieve
better communication and signal integrity. You will want to terminate when the communication is
at a high data rate or over a long distance. Termination can be harmful because it increases the
current in the line, and causes more radiation that could interfere with signals.
Jumper JP1 places 100 Ohms termination across RS422 receive data pins 5 & 6:
1. Disconnect the RS-232/422/485 connectors.
2. Slide the card out of the cardframe.
3. Locate the JP1 jumper (see FIG. 1 on page 1).
4. Install the jumper in the 'ON' position (default setting = OFF).
5. Slide the card back into the cardframe.
6. Reconnect the RS-232/422/485 connectors.
Setting jumper JP2 to set the RS-422 port for RS-485 use
1. Disconnect the RS-232/422/485 connectors.
2. Slide the card out of the cardframe.
3. Locate the JP2 jumper (see FIG. 1 on page 1).
4. Set jumper JP2 to the ON position (default setting is OFF).
5. Slide the card back into the cardframe.
6. Reconnect the RS-232/422/485 connectors.
Static electricity can damage electronic components. Before opening the device,
discharge any accumulated static electricity from your body by touching a grounded
metal object.