This serial cable by Delock is a full handshake null modem cable with RTS / CTS and DTR / DTS data flow control. This cable offers the possibility to connect RS-232 devices directly with each other. Optionally, devices can be supplied with power via the RI line.
Mini D-Sub 9 connector
These cables fit any RS-232 port, as the mini D-Sub 9 connectors (44 x 33.3 x 15 mm) are small and compact. In this way, RS-232 connections can be used next to each other.
Here you can find information about Null modem cables for RS-232 connections
Here you can find information about PCIe cards with serial RS-232 interfaces inclusive power supply