Comments (2)
After many attempts, I managed to make a server that is working. This is the template I used (I removed all the code that actually gets the correct values)
// npm modules
const modbus = require('modbus-stream');
// kill logging
process.on('SIGINT', function () {
console.error('Process killed by SIGINT');
process.exit();
});
// exception logging
process.on('uncaughtException', function (error) {
console.error('Uncaught Exception thrown', error);
process.exit(1);
});
// env variables
const SERVER_PORT = process.env.SERVER_PORT || 502;
modbus.tcp.server({ debug: 'server' }, (connection) => {
console.log('connected');
connection.on('close', () => {
console.log('close');
});
connection.on('error', (error) => {
console.log('error', error);
});
connection.on('read-coils', (request, reply) => {
console.log('\tread-coils', request.request);
const values = [];
for (let i = 0; i < request.request.quantity; ++i) {
const address = request.request.address + i;
const value = 0; // replace this with actual value
values.push(value);
}
reply(null, values);
});
connection.on('read-discrete-inputs', (request, reply) => {
console.log('\tread-discrete-inputs', request.request);
});
connection.on('read-holding-registers', (request, reply) => {
console.log('\tread-holding-registers', request.request);
const values = [];
for (let i = 0; i < request.request.quantity; ++i) {
const address = request.request.address + i;
const value = Buffer.from([ 0x00, 0x00 ]); // replace this with actual value
values.push(value);
}
reply(null, values);
});
connection.on('read-input-registers', (request, reply) => {
console.log('\tread-input-registers', request.request);
});
connection.on('write-single-coil', (request, reply) => {
console.log('\twrite-single-coil', request.request);
});
connection.on('write-single-register', (request, reply) => {
console.log('\twrite-single-register', request.request);
});
connection.on('write-multiple-coils', (request, reply) => {
console.log('\twrite-multiple-coils', request.request);
});
connection.on('write-multiple-registers', (request, reply) => {
console.log('\twrite-multiple-registers', request.request);
});
connection.on('data', (request, reply) => {
console.log('\tdata', request.request);
});
}).listen(SERVER_PORT, () => {
console.log(`Server listening on ${SERVER_PORT}`);
});
from stream.
It was not obvious for me as well, but i managed to write a simple modbus server script with this library.
Here is the link for the code if anybody is interested in another example how to use the library: https://github.com/nett-media/modbus-server/blob/master/modbus-server.js
from stream.
Related Issues (20)
- Error on install
- I Don't understanding is problem, please recommend to me. Thanks HOT 2
- How to set socket options for ModbusTCP connection? (e.g. keep-alive) HOT 1
- no connection timeout adjustment? HOT 1
- TypeScript error when using node 14 type definitions
- ReadCoils returns IllegalDataAddress if the value of the address is over 1016 HOT 1
- Keep getting GatewayTargetDeviceFailedToRespond HOT 18
- Can we split modbus-stream into modbus-stream-core and modbus-stream HOT 13
- Won't install [email protected] dependency on Mac OS 11.3.1 HOT 2
- Query three different registers HOT 12
- Error reading Modbus TCP/IP on a network HOT 1
- Convert response from ReadHoldingRegisters to Decimal HOT 2
- Problems with reconnect HOT 4
- How to catch tcp transport errors HOT 5
- Modbus ERROR: GatewayPathUnavailable HOT 7
- Question: Trying to reset a count function HOT 5
- TypeError: serialport is not a constructor
- How does requests work with ReadFile and WriteFile? HOT 1
- How to set up a keepalive for client connections?
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from stream.