Null modem - Wikipedia
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Serial WiFi Adapter - RS232
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Wireless serial RS232 adapter - Industrial
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RS232 modem - All industrial manufacturers
Data Connect - The Right Connection | IGV23 Modem – Data Connect – The Right Connection
RS232 modem - All industrial manufacturers
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Crossover or "Null Modem" vs. Straight Through Serial Cable - Decisive Tactics, Inc.
DB9 RS232 Serial Cable Male to Female Null Modem Cord Full Handshaking 7 Wire Crossover for Data Communication (5 - Walmart.com
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