The control card may indicate that the program is on the master system tape or on CARDS.
控制卡可以指出程序是在主系统带上还是其他卡片上。
Each link in the chain may contain a pointer to the next link, or there may be a master control or program instructing the programs to link together.
链路中每一个链接拥有一根指针指向下一个链接，或者有一个主控制或程序指导那些程序链接在一起。
At last, the communication program applied in Master-Slave control system base on MODBUS protocol is designed.
最后设计应用于主从式控制系统的通讯程序，这个程序是基于MODBUS协议的。
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