RS485/ 422 signal surge protector Communication Standard Accord EIA RS-485/ 422 standard RS485/ 422 signal IEC6100-4-5 and ITU-TK20& 21 Working voltage 0-5V Limit voltage
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Modem Wavecom M1206B Chipset Q2403A or Q2403B. Available for USB and RS232 type. Contac YM Liando1974