/**
* Send a request to JAMod library. Opens and closes the connection each time. Otherwise the TCP
* Stack of the slaves seams to have problems creating a response.
*
* @param request
* @return the response
*/
private ModbusResponse sendRequest(ModbusRequest request) {
if (request == null) return null;
prepareConnection();
ModbusResponse response = null;
transaction.setRequest(request);
try {
transaction.execute();
response = transaction.getResponse();
} catch (Exception e) {
log.warning("Sending request not successful: " + e.getMessage());
}
this.connection.close();
return response;
}
public static void main(String[] args) {
TCPMasterConnection con = null;
ModbusTCPTransaction trans = null;
ReadInputDiscretesRequest req = null;
ReadInputDiscretesResponse res = null;
InetAddress addr = null;
int ref = 0;
int count = 0;
int repeat = 1;
int port = Modbus.DEFAULT_PORT;
try {
// 1. Setup the parameters
if (args.length < 3) {
printUsage();
System.exit(1);
} else {
try {
String astr = args[0];
int idx = astr.indexOf(':');
if (idx > 0) {
port = Integer.parseInt(astr.substring(idx + 1));
astr = astr.substring(0, idx);
}
addr = InetAddress.getByName(astr);
ref = Integer.parseInt(args[1]);
count = Integer.parseInt(args[2]);
if (args.length == 4) {
repeat = Integer.parseInt(args[3]);
}
} catch (Exception ex) {
ex.printStackTrace();
printUsage();
System.exit(1);
}
}
// 2. Open the connection
con = new TCPMasterConnection(addr);
con.setPort(port);
con.connect();
if (Modbus.debug) System.out.println("Connected to " + addr.toString() + ":" + con.getPort());
// 3. Prepare the request
req = new ReadInputDiscretesRequest(ref, count);
// ReadCoilsRequest req = new ReadCoilsRequest(ref, count);
req.setUnitID(0);
if (Modbus.debug) System.out.println("Request: " + req.getHexMessage());
// 4. Prepare the transaction
trans = new ModbusTCPTransaction(con);
trans.setRequest(req);
trans.setReconnecting(false);
// 5. Execute the transaction repeat times
int k = 0;
do {
trans.execute();
res = (ReadInputDiscretesResponse) trans.getResponse();
// ReadCoilsResponse res = (ReadCoilsResponse)
// trans.getResponse();
if (Modbus.debug) System.out.println("Response: " + res.getHexMessage());
System.out.println("Digital Inputs Status=" + res.getDiscretes().toString());
// System.out.println("Coils Status=" +
// res.getCoils().toString());
k++;
} while (k < repeat);
// 6. Close the connection
con.close();
} catch (Exception ex) {
ex.printStackTrace();
}
} // main