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The DOC device is installed in the socket-strips designated as U2. Pin 1
of the DOC should be oriented toward the outer edge of the board.
The DOC is enabled and disabled by using pins 7 and 8 of the jumper
block at J3. The jumpering configurations for J3 are:
1 3 5 7 9 11 13
o o o o o o o
o o o o o o o
2 4 6 8 10 12 14
DOC Enabled
Serial Interface
serial ports. COM3 and COM4 are RS-232 only and are present inside
the SMSC 37C727 Super I/O chip. COM3 and COM4 are fully plug-and-
play compatible (PnP) and are configurable using the BIOS setup menus. Connection
to COM3 and COM4 is made via the connector at J11. J11 pinout is shown on the
following page.
COM1 and COM2 can be individually configured for any one of a number of operating
modes using the jumper blocks at J7 and J10. These modes include:
1. RS-232 Mode
2. RS-422 Mode with RTS transmitter enable
3. RS-422 Mode with auto transmitter enable
4. RS-485 Mode with RTS transmitter enable
5. RS-485 Mode with RTS transmitter enable and echo back
6. RS-485 Mode with auto transmitter enable
7. RS-485 Mode with auto transmitter enable and echo back
Modes 2, 4 and 5 require the RTS bit in the MCR (Bit 1) be set in order to Transmit.
Modes 4 and 6 require that RTS in the MCR (Bit 1) be deasserted in order to receive.
Each of the RS-422/RS-485 modes also allows for jumper selection of transmit and/or
receive termination resistor(s).
COM1 and COM2 ports that allow the user to select the operating mode and its
optional features and termination.
numbers are shown in the following table.
when RS-422 or RS-485 modes are used.
TX(100)
- Places a 100 ohm resistor across the TX+/TX- pair.
RX(100)
- Places a 100 ohm resistor across the RX+/RX- pair.
TX-RX(300)
- Places a 100 ohm resistor from +5V to TX/RX+, a 100 ohm resistor from
TX-RX- to ground and a 100 ohm resistor between TX-RX+ and TX/RX-.
070223
1 3 5 7 9 11 13
o o o o o o o
o o o o o o o
2 4 6 8 10 12 14
– The SAT-520Plus contains four 16550 compatible
There is an 18-pin configuration jumper for both
The jumper numbers and corresponding port
Operations Manual SAT-520PLUS
DOC Disabled
There are three choices for termination
Visual
Index
Visual
Index
6
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