Wireless serial RS232 adapter - Industrial
Wireless modem - TDi2 - Radiometrix - RS232 / radio / RF
Null modem - Wikipedia
Bluetooth dongle
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Cable to connect to printer
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File:External rs232 serial dialup fax modem.jpg - Wikimedia Commons
RS232 Protocol – Basics - ElectronicsHub
RS232 Serial Wifi Modem for Vintage Computers V4 from The Old Net on Tindie
GSM Modem RS232/485 | Serial GSM Modems
Data Connect - The Right Connection | IGV23 Modem – Data Connect – The Right Connection
DKO Modem – Serial Tools
