ICB-534 Booster for RS232 signal can extend cable length. Works with a wide voltage swing and outputs
-11V to +11V signal making it suitable for legacy and non-conforming RS232 equipment.
Brainboxes ES-357 Ethernet to serial device server provides access to one RS232 and one RS422/485 serial port. Data transfer rates up to 1,000,000 baud, coupled with 1Mbit/s line drivers deliver uncompromising performance.