GP2500s和OMRON CS系列PLC连接的问题，采用RS232电缆连接，并对GP和PLC分别进行了如下设置；
GP setup PLC setup
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Boud rate 19200 | Boud rate 19200
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Data length 7 | Data length 7
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Stop bit 2 | Stop bit 2
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Parity bit Even | Parity bit Even
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Data FlowControl ER |
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Communication Fomat RS232 |
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Unit NO. 0 | Station NO. 0
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sw1:off sw5:off
Dip Switch sw7:off sw8;off
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Mode Setup Host Link
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但是上点后GP上仍然显示；PLC没有响应，而不是显示：PLC没有连接，这是怎么一回事？？请指点
