COMPUTER MODULES, INC. ====================== LPC SERIAL/2A Card Type Serial Chip Set Zilog I/O Options Serial ports (2) Data Bus 8-bit ISA +------------------------------------------------------------+ | 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. | +------------------------------------------------------------+