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StarTech.com USB to Null Modem RS232 DB9 Serial DCE Adapter Cable with FTDI - ICUSB232FTN - Serial Adapters - CDW.com
RS232 Wireless serial adapter
TMAS 4G GSM MODEM RS232 INTERFACE - Modems from RF Solutions UK
GSM Modem RS232/485 | Serial GSM Modems-PUSR IOT
Cable to connect to printer
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3ft (0.9m) Serial RS232 DB9 Null Modem Cable with Low Profile Connectors M/M - In-Wall CMG-Rated | Serial RS232 | Computer Cables | USB and PC
Industrial Wireless Rs232 Serial Gsm Gprs Modem With Sim Slot - Modems & Gateways - AliExpress
35ft (10.7m) Serial RS232 DB9 Null Modem Cable with Low Profile Connectors F/F - In-Wall CMG-Rated | Serial RS232 | Computer Cables | USB and PC
GSM Modem RS232/485 | Serial GSM Modems-PUSR IOT
BB-9PMDS-ULI-262D, ULI-262D - RS-232 9-Pin Modem Data Splitter
Serial RS232 to Ethernet / WiFi Gateway
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