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# COMPUTER MODULES, INC.
LPC SERIAL/2A
Card Type Serial
Chip Set Zilog
I/O Options Serial ports (2)
Data Bus 8-bit ISA
(IMG) IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|---------------------------+-------+----------------+-------|
| Serial port 1 (May be | J1 | Serial port 2 | J2 |
| RS-232, RS-422/423, or | | (RS-232 only) | |
| RS-485) | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| USER CONFIGURABLE SETTINGS |
|------------------------------------------------------------|
| Setting | Label | Position |
|----------------------------------------+--------+----------|
| » | Factory configured - do not alter | SW1/1 | Off |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CLOCK SOURCE FOR PORT 1 |
|------------------------------------------------------------|
| Setting | JB3 |
|---------------------------------+--------------------------|
| External clock from serial RTxC | Pins 1 & 2 closed |
|---------------------------------+--------------------------|
| Internal clock from 8254 | Pins 1 & 3, 2 & 4 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CHANNEL - RECEIVE |
|------------------------------------------------------------|
| Setting | JB1 |
|----------------------------+-------------------------------|
| DMA1 | Pins 9 & 10, 13 & 14 closed |
|----------------------------+-------------------------------|
| DMA3 | Pins 10 & 12, 14 & 16 closed |
|----------------------------+-------------------------------|
| Disabled | Above pins open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DMA CHANNEL - TRANSMIT |
|------------------------------------------------------------|
| Setting | JB1 |
|-------------------+----------------------------------------|
| DMA1 | Pins 9 & 11, 13 & 15 closed |
|-------------------+----------------------------------------|
| DMA3 | Pins 11 & 12, 15 & 16 closed |
|-------------------+----------------------------------------|
| Disabled | Above pins open |
|------------------------------------------------------------|
| Note: If a DMA is used for transmission then port 1 |
| may not be used. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BASE I/O ADDRESS |
|------------------------------------------------------------|
| Setting | SW1/2 |SW1/3 |SW1/4 |SW1/5 |SW1/6 |SW1/7 |SW1/8 |
|----------+-------+------+------+------+------+------+------|
| | 000h | On | On | On | On | On | On | On |
|---+------+-------+------+------+------+------+------+------|
| | 008h | On | On | On | On | On | On | Off |
|---+------+-------+------+------+------+------+------+------|
| | 010h | On | On | On | On | On | Off | On |
|---+------+-------+------+------+------+------+------+------|
| | 018h | On | On | On | On | On | Off | Off |
|---+------+-------+------+------+------+------+------+------|
| | 020h | On | On | On | On | Off | On | On |
|---+------+-------+------+------+------+------+------+------|
|» | 380h | Off | Off | Off | On | On | On | On |
|---+------+-------+------+------+------+------+------+------|
| | 3D8h | Off | Off | Off | Off | On | Off | Off |
|---+------+-------+------+------+------+------+------+------|
| | 3E0h | Off | Off | Off | Off | Off | On | On |
|---+------+-------+------+------+------+------+------+------|
| | 3E8h | Off | Off | Off | Off | Off | On | Off |
|---+------+-------+------+------+------+------+------+------|
| | 3F0h | Off | Off | Off | Off | Off | Off | On |
|---+------+-------+------+------+------+------+------+------|
| | 3F8h | Off | Off | Off | Off | Off | Off | Off |
|------------------------------------------------------------|
| Note: A total of 127 base address settings are |
| available. The switches are a binary representation of |
| the decimal memory addresses. SW1/2 is the Most |
| Significant Bit and switch SW1/8 is the Least |
| Significant Bit. The switches have the following |
| decimal values: SW1/8=8, SW1/7=16, SW1/6=32, SW1/5=64, |
| SW1/4=128, SW1/3=256, SW1/2=512. Turn off the switches |
| and add the values of the switches that are off to |
| obtain the correct memory address. (Off=1, On=0) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| INTERRUPT |
|------------------------------------------------------------|
| Setting | JB1 |
|-----------------------------+------------------------------|
| IRQ3 internally | Pins 1 & 2 closed |
|-----------------------------+------------------------------|
| IRQ3 from 8254 | Pins 1 & 3 closed |
|-----------------------------+------------------------------|
| IRQ4 internally | Pins 2 & 4 closed |
|-----------------------------+------------------------------|
| IRQ4 from 8254 | Pins 3 & 4 closed |
|-----------------------------+------------------------------|
| IRQ5 internally | Pins 5 & 6 closed |
|-----------------------------+------------------------------|
| IRQ5 from 8254 | Pins 5 & 7 closed |
|-----------------------------+------------------------------|
| IRQ7 internally | Pins 6 & 8 closed |
|-----------------------------+------------------------------|
| IRQ7 from 8254 | Pins 7 & 8 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PORT 1 TYPE |
|------------------------------------------------------------|
| Setting | JB4 | U5 | U6 | U9 | U10 |
|----------+---------+---------+---------+---------+---------|
| RS-232 |Pins 1 & | Not | MC1489 | Not | MC1488 |
| |2, 4 & 5 |installed| |installed| |
| | open | | | | |
|----------+---------+---------+---------+---------+---------|
|RS-422/423|Pins 1 & | 26LS32 | Not | 26LS31 | Not |
| |2, 4 & 5 | |installed| |installed|
| | open | | | | |
|----------+---------+---------+---------+---------+---------|
| RS-485 |Pins 1 & | 26LS32 | Not | 26LS31 | Not |
| |2, 4 & 5 | |installed| |installed|
| | closed | | | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PORT 1 PINS 9 & 10 |
|------------------------------------------------------------|
| Setting | JB3 |
|----------------------------+-------------------------------|
| +12V DC | Pins 7 & 8 closed |
|----------------------------+-------------------------------|
| Not used | Pins 7 & 8 open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PORT 1 RS-422/423/485 DRIVER |
|------------------------------------------------------------|
| Setting | JB3 |
|-------------------------------+----------------------------|
| Enabled by RTS | Pins 5 & 6 closed |
|-------------------------------+----------------------------|
| Enabled permanently | Pins 3 & 5 closed |
+------------------------------------------------------------+
+------------------------------------------------------------+
| PORT 1 RS-422/423 DRIVER TERMINATION |
|------------------------------------------------------------|
| Setting | JB4 | RP3 | RP4 |
|--------------+-------------------+------------+------------|
| Not | Pins 5 & 6, 7 & 8 | Not | Not |
| terminated | closed | installed | installed |
|--------------+-------------------+------------+------------|
| Terminated | Pins 5 & 7, 6 & 8 | Installed | Installed |
| | closed | | |
|------------------------------------------------------------|
| Note: The ohm values of RP3 and RP4 should be |
| determined to cause a difference in voltage of at |
| least 2.0V between the ends of the serial cable. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 8254 CLK0 SOURCE |
|------------------------------------------------------------|
| Setting | JB2 |
|-----------------------------+------------------------------|
| 8254 clock signal | Pins 15 & 16 closed |
|-----------------------------+------------------------------|
| Disabled | Pins 15 & 16 open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 8254 CLK1 SOURCE |
|------------------------------------------------------------|
| Setting | JB2 |
|-----------------------------+------------------------------|
| 8254 clock signal | Pins 13 & 14 closed |
|-----------------------------+------------------------------|
| 8254 CLK0 | Pins 11 & 13 closed |
|-----------------------------+------------------------------|
| Disabled | Above pins open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| 8254 CLK2 SOURCE |
|------------------------------------------------------------|
| Setting | JB2 |
|-----------------------------+------------------------------|
| 8254 clock signal | Pins 10 & 12 closed |
|-----------------------------+------------------------------|
| 8254 CLK1 | Pins 9 & 10 closed |
|-----------------------------+------------------------------|
| Disabled | Above pins open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CLK0 INTERRUPT GENERATOR |
|------------------------------------------------------------|
| Setting | JB2 |
|----------------------------------+-------------------------|
| CLK0 generates interrupt | Pins 7 & 8 closed |
|----------------------------------+-------------------------|
| CLK0 does not generate interrupt | Pins 7 & 8 open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CLK1 INTERRUPT GENERATOR |
|------------------------------------------------------------|
| Setting | JB2 |
|----------------------------------+-------------------------|
| CLK1 generates interrupt | Pins 5 & 6 closed |
|----------------------------------+-------------------------|
| CLK1 does not generate interrupt | Pins 4 & 6 open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| CLK2 INTERRUPT GENERATOR |
|------------------------------------------------------------|
| Setting | JB2 |
|----------------------------------+-------------------------|
| CLK2 generates interrupt | Pins 1 & 3 closed |
|----------------------------------+-------------------------|
| CLK2 does not generate interrupt | Pins 1 & 2 open |
+------------------------------------------------------------+
+------------------------------------------------------------+
| MISCELLANEOUS TECHNICAL NOTE |
|------------------------------------------------------------|
| When using RS-422, resistors R2, R3, R5, and R6 must |
| be installed to match the impedance of the cable that |
| is used. The board will not function properly in |
| RS-422 mode without these resistors. |
+------------------------------------------------------------+