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撥碼開關 diswitch

1. and afford dip switch . not have to setting 提供dip撥碼開關，無須設置

2. digit toggle switch 四位撥碼開關

3. at the same time , this kind of gprs terminal not only supports " transparent data transmission " , but also has three kinds of interface voltage levels ( ttl / rs232 / rs485 ) that can be changed by setting the switcher 并且該gprs終端不但支持透明的數據傳輸，而且可通過撥碼開關實現ttl rs232 rs485二種接口電平的轉換，因此可以） ’ “泛應川到其它、業比川無線數據傳輸領域。