8ch 5V 12V 24V RS232 IO Control Switch Board Com DB9 Serial Port Relais Modul
ab 30,45 €
3: Two serial ports: RS232 DB9 interface, TTL 232 interface. With RS232 DB9 interface and TTL 232 interface. 6 Two kinds of commands: AT command and 8-byte command, the two commands are automatically recognized, no need to switch.
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