问题描述
必须在 Spring Boot 上使用 Modbus 协议 实现对 数字 IO 的调用> 项目由 Maven 构建。
它应该是在身体上有一定持续时间(如 5 秒等)的脉冲呼叫
这里是规范的片段:
关于响应和错误的更多信息:
似乎在这个调用应用程序应该表现得像一个主人。在这种情况下,Web Relay 应该像奴隶一样。
我认为采用一些库来与 Modbus 集成比从零开始编写要好得多。
更新:
这是代码部分:
@Override
public void callDigitalIO(String ipAddress,String relay) {
log.debug("call Digital IO by MODBUS");
checkNotEmpty(ipAddress,relay);
ModbusTcpMasterConfig config = new ModbusTcpMasterConfig.Builder(ipAddress).build();
ModbusTcpMaster master = new ModbusTcpMaster(config);
master.connect();
ByteBuf buffer = Unpooled.buffer();
buffer.writeInt(0x00003F00);
buffer.writeInt(0x000040A0);
int relayNum = Integer.parseInt(relay);
WriteMultipleRegistersRequest request = new WriteMultipleRegistersRequest(
relayNum,0x02 * relayNum,buffer
);
log.debug("MODBUS_REQUEST: {}",request);
master.sendRequest(request,0xFF)
.whenCompleteAsync((response,ex) -> {
if (response != null) {
log.info("MODBUS_RESPONSE: {}",response);
} else {
log.error("EXECUTION_Failed: {}",ex.getMessage(),ex);
}
});
master.disconnect();
}
2021-02-25 22-07-03.955 [carpark-ex-4] DEBUG c.s.s.dio.ModbusDigitalIoServiceImpl - MODBUS_REQUEST: WriteMultipleRegistersRequest(UnpooledByteBufAllocator$InstrumentedUnpooledUnsafeHeapByteBuf(ridx: 0,widx: 8,cap: 256))
2021-02-25 22-07-03.970 [ForkJoinPool.commonPool-worker-5] ERROR c.s.s.dio.ModbusDigitalIoServiceImpl - EXECUTION_Failed: not connected
java.lang.Exception: not connected
at com.digitalpetri.netty.fsm.ChannelFsmFactory.lambda$null$2(ChannelFsmFactory.java:115)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630)
at java.base/java.lang.Thread.run(Thread.java:832)
只有当我这样做时:
master.sendRequest(request,0xFF).get()
它开始工作了。
解决方法
使用支持 WriteMultipleRegisters 函数的现有库应该很容易实现这一点。
试试https://github.com/digitalpetri/modbus
如何根据文档截图构建 WriteMultipleRegisters 请求的示例:
class Scratch {
public static void main(String[] args) throws ExecutionException,InterruptedException {
ModbusTcpMasterConfig config = new ModbusTcpMasterConfig.Builder("ip_or_hostname").build();
ModbusTcpMaster master = new ModbusTcpMaster(config);
master.connect().get();
ByteBuf buffer = Unpooled.buffer();
buffer.writeInt(0x00003F00);
buffer.writeInt(0x000040A0);
WriteMultipleRegistersRequest request = new WriteMultipleRegistersRequest(
0x16,0x04,buffer
);
master.sendRequest(request,0xFF).get();
}
}