拨码开关 diswitch

1. and afford dip switch . not have to setting 提供dip拨码开关，无须设置

2. digit toggle switch 四位拨码开关

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 并且该gprs终端不但支持透明的数据传输，而且可通过拨码开关实现ttl rs232 rs485二种接口电平的转换，因此可以） ’ “泛应川到其它、业比川无线数据传输领域。