手机必须工作在旁路模式，也就是说，它必须直接连接到其他分机。
The phone must not be working in bypass mode, i. e. it must be connecting directly to the other extension.
系统包括上位机软件、RS232—485转换器、分机模块及电缆连接4部分，其监控程序的设计采用顺序查询的方式执行主程序。
The system consists of upper computer software, RS232-485 converter, every kind of modules and cables. And finally the monitor program is designed with the sequential query mode.
主机和分机采用直流母线的方式连接，能量和通信信号都通过母线传递。
Linking of the host and extensions is based on DC bus mode, both energy and communication signal transfer through DC bus.
主机和分机采用直流母线的方式连接，能量和通信信号都通过母线传递。
Linking of the host and extensions is based on DC bus mode, both energy and communication signal transfer through DC bus.
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