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# B & B ELECTRONICS
3PXOCC1A, 3PXOCC1B
Card Type Serial
Chipset 16550A (3PXOCC1A)
16750 (3PXOCC1B)
I/O Options Serial port
Data Bus 8/16 bit ISA
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label |
|---------------------------------------+--------------------|
| RS-232, RS-422, or RS-485 serial port | J2 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|----------------------------------------+-------+-----------|
| » | RS-485 receiver disabled when | JP3/B | Pins 2 & |
| | transmitting | | 3 closed |
|---+------------------------------------+-------+-----------|
| | RS-485 receiver always enabled | JP3/B | Pins 1 & |
| | | | 2 closed |
|---+------------------------------------+-------+-----------|
| | RS-485 transmitter enabled on high | JP2 | Pins 2 & |
| | RTS only | | 3 closed |
|---+------------------------------------+-------+-----------|
| | RS-485 transmitter enabled | JP2 | Pins 1 & |
| | whenever transmission is attempted | | 2 closed |
|---+------------------------------------+-------+-----------|
| » | Serial port clock speed normal | JP5 | Pins 2 & |
| | | | 3 closed |
|---+------------------------------------+-------+-----------|
| | Serial port clock speed multiplied | JP5 | Pins 1 & |
| | by 4 | | 2 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT CONFIGURATION |
|------------------------------------------------------------|
| Setting | JP1/A |JP1/B |JP1/C |JP1/D | JP2 |JP3/A |JP3/B |
|---------+---------+------+------+------+-----+------+------|
| RS-232 |Pins 2 & |Pins 2|Pins 2|Pins 2|Pins | N/A | N/A |
| | 3 | & 3 | & 3 | & 3 |2 & 3| | |
|---------+---------+------+------+------+-----+------+------|
| RS-422 |Pins 1 & |Pins 1|Pins 1|Pins 1| N/A |Pins 1|Pins 1|
| | 2 | & 2 | & 2 | & 2 | | & 2 | & 2 |
|---------+---------+------+------+------+-----+------+------|
| RS-485 |Pins 1 & |Pins 1|Pins 1|Pins 1| See |Pins 2| See |
| | 2 | & 2 | & 2 | & 2 |note | & 3 | note |
|------------------------------------------------------------|
| Note:For correct settings of JP2 and JP3/B for RS-485 |
| mode, see their entries in the User Configurable |
| Settings table. |
| |
| Pins designated are in the closed position. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT SELECTION |
|------------------------------------------------------------|
| Setting | JP4/A | JP4/B | JP4/C | JP4/D | JP4/E | JP4/F |
|----------+--------+--------+-------+-------+-------+-------|
| |IR/FONT>| Closed | Open | Open | Open | Open | Open |
|-+--------+--------+--------+-------+-------+-------+-------|
| | IRQ3 | Open | Closed | Open | Open | Open | Open |
|-+--------+--------+--------+-------+-------+-------+-------|
|»| IRQ4 | Open | Open |Closed | Open | Open | Open |
|-+--------+--------+--------+-------+-------+-------+-------|
| | IRQ5 | Open | Open | Open |Closed | Open | Open |
|-+--------+--------+--------+-------+-------+-------+-------|
| | IRQ6 | Open | Open | Open | Open |Closed | Open |
|-+--------+--------+--------+-------+-------+-------+-------|
| | IRQ7 | Open | Open | Open | Open | Open |Closed |
|-+--------+--------+--------+-------+-------+-------+-------|
| | IRQ10 | Open | Open | Open | Open | Open | Open |
|-+--------+--------+--------+-------+-------+-------+-------|
| | IRQ11 | Open | Open | Open | Open | Open | Open |
|-+--------+--------+--------+-------+-------+-------+-------|
| | IRQ12 | Open | Open | Open | Open | Open | Open |
|-+--------+--------+--------+-------+-------+-------+-------|
| | IRQ14 | Open | Open | Open | Open | Open | Open |
|-+--------+--------+--------+-------+-------+-------+-------|
| | IRQ15 | Open | Open | Open | Open | Open | Open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT SELECTION (CON’T) |
|------------------------------------------------------------|
| Setting | JP4/G | JP4/H | JP4/I | JP4/J | JP4/K |
|--------------+---------+--------+--------+--------+--------|
| | IR/FONT> | Open | Open | Open | Open | Open |
|---+----------+---------+--------+--------+--------+--------|
| | IRQ3 | Open | Open | Open | Open | Open |
|---+----------+---------+--------+--------+--------+--------|
| » | IRQ4 | Open | Open | Open | Open | Open |
|---+----------+---------+--------+--------+--------+--------|
| | IRQ5 | Open | Open | Open | Open | Open |
|---+----------+---------+--------+--------+--------+--------|
| | IRQ6 | Open | Open | Open | Open | Open |
|---+----------+---------+--------+--------+--------+--------|
| | IRQ7 | Open | Open | Open | Open | Open |
|---+----------+---------+--------+--------+--------+--------|
| | IRQ10 | Closed | Open | Open | Open | Open |
|---+----------+---------+--------+--------+--------+--------|
| | IRQ11 | Open | Closed | Open | Open | Open |
|---+----------+---------+--------+--------+--------+--------|
| | IRQ12 | Open | Open | Closed | Open | Open |
|---+----------+---------+--------+--------+--------+--------|
| | IRQ14 | Open | Open | Open | Closed | Open |
|---+----------+---------+--------+--------+--------+--------|
| | IRQ15 | Open | Open | Open | Open | Closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SERIAL PORT ADDRESS SELECTION |
|------------------------------------------------------------|
| Setting |SW1/1 |SW1/2 |SW1/3 |SW1/4 |SW1/5 |SW1/6 |SW1/7 |
|-----------+------+------+------+------+------+------+------|
| | 000h | On | On | On | On | On | On | On |
|--+--------+------+------+------+------+------+------+------|
| | 008h | Off | On | On | On | On | On | On |
|--+--------+------+------+------+------+------+------+------|
| | 010h | On | Off | On | On | On | On | On |
|--+--------+------+------+------+------+------+------+------|
| | 018h | Off | Off | On | On | On | On | On |
|--+--------+------+------+------+------+------+------+------|
| | 020h | On | On | Off | On | On | On | On |
|--+--------+------+------+------+------+------+------+------|
| | 2E8h | Off | On | Off | Off | Off | On | Off |
| |(COM4:) | | | | | | | |
|--+--------+------+------+------+------+------+------+------|
| | 2F8h | Off | Off | Off | Off | Off | On | Off |
| |(COM2:) | | | | | | | |
|--+--------+------+------+------+------+------+------+------|
| | 3D8h | Off | Off | On | Off | Off | Off | Off |
|--+--------+------+------+------+------+------+------+------|
| | 3E0h | On | On | Off | Off | Off | Off | Off |
|--+--------+------+------+------+------+------+------+------|
| | 3E8h | Off | On | Off | Off | Off | Off | Off |
| |(COM3:) | | | | | | | |
|--+--------+------+------+------+------+------+------+------|
| | 3F0h | On | Off | Off | Off | Off | Off | Off |
|--+--------+------+------+------+------+------+------+------|
|» | 3F8h | Off | Off | Off | Off | Off | Off | Off |
| |(COM1:) | | | | | | | |
|------------------------------------------------------------|
| Note: A total of 128 base address settings are |
| available. The switches are a binary representation of |
| the decimal memory addresses. SW1/7 is the Most |
| Significant Bit and switch SW1/1 is the Least |
| Significant Bit. The switches have the following |
| decimal values: SW1/7=512, SW1/6=256, SW1/5=128, |
| SW1/4=64, SW1/3=32, SW1/2=16, SW1/1=8. Turn off the |
| switches and add the values of the switches that are |
| off to obtain the correct memory address. (Off=1, On=0)|
+------------------------------------------------------------+