https://www.systerra.de/IDAN-CM17320HR.html
Stackable Packaging System for CM17320. The CM17320HR Module is designed to provide eight independent PCI serial ports with RS-232, RS-422, or RS-485 interfaces for PC/104-Plus based systems ...
https://www.systerra.de/IDAN-CM18320HR.html
Stackable Packaging System for CM18320. The CM18320 is an octal serial port module with PCI-104 stackable bus structure. It provides eight individual serial ports that are configurable for RS-232/422/485...
https://www.systerra.de/IDAN-CM310HR.html
Stackable Packaging System for CM310HR. The RTD CM310HR module supports four versatile serial ports for the 16 (Intel) bus interface type, with jumper configurable IRQ lines and I/O addresses ...
https://www.systerra.de/IDAN-CM316HR.html
Stackable Packaging System for CM316HR. The RTD CM316 dual serial synchronous/asynchronous port module supports asynchronous (RS422/RS485/RS232) and synchronous byte and bit oriented data transfers, with jumper configurable IRQ lines, DMA lines and I/O addresses ...