使用零调制解调器连接时，发送线和接收线要交叉连接。
With a null modem connection, the transmit and receive lines are cross-linked.
根据使用目的而定，有时需要交叉连接一个或多个握手线。
Depending on the purpose, sometimes one or more handshake lines are cross-linked.
这就避免了在使用液体或气体产品之间的交叉连接。
This is to prevent cross connections between processes using liquid or gaseous product.
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