Emerald-MM-8Plus is a PC/104-Plus module with four or eight serial ports connected through the PCI bus. Each port supports RS-232, RS-422, RS-485 and 5V TTL interfaces using jumper configuration. The board also has eight digital I/O lines and a 16-bit counter/timer.
Emerald-MM-8Plus is connector compatible with the Emerald-MM-8P, Emerald-MM-8M, and Emerald-MM-8232 boards. It is compatible with all Diamond Systems Corporation CPUs with PC/104-Plus connectors. The board is intended to be compatible with any CPU with a PC/104-Plus expansion socket and operates with both 3.3V and 5V PCI I/O voltage buses.
Two I/O headers are provided, with four serial ports on each header. The board operates on +5V only, eliminating the need for a +12V supply that is often required for serial port operation.
Emerald-MM-8Plus is based on the Exar XR17D158IV Octal UART. This device contains eight identical sets of registers, one set for each port. The registers are compatible with the standard PC serial port. Each port contains a 64-byte FIFO.
The Emerald-MM-8Plus has the following features.
Refer to the Exar XR17D158IV datasheet, listed in the Additional Information section of this document, for detailed information about using the UART, DIO and EEPROM functionality with the PC/104-Plus bus.
Figure 1 shows the Emerald-MM-8Plus functional blocks.
Figure 2 shows the Emerald-MM-8Plus board connectors and jumpers.
The following tables list the Emerald-MM-8Plus board connectors.
|Connector||Description||Manufacturer Part No.|
|J1||PC/104, ISA bus A,B||EPT 962-60323-12B|
|J2||PC/104, ISA bus C,D||EPT 962-60203-12B|
|J3||PC/104-Plus PCI bus connector||-|
|J4||Serial ports 1-4||-|
|J5||Serial ports 5-8||-|
|J15||Digital I/O and counter/timer||-|
The following table lists the Emerald-MM-8Plus jumpers.
|J6||PCI bus slot selection.|
|J7-J10||Serial port configuration (Serial ports 1-4, respectively).|
|J11-J14||Serial port configuration (Serial ports 5-8, respectively).|