modbus-serial
Version:
A pure JavaScript implemetation of MODBUS-RTU (Serial and TCP) for NodeJS.
206 lines (189 loc) • 9.6 kB
JavaScript
;
/* eslint-disable no-undef */
const expect = require("chai").expect;
const mockery = require("mockery");
const LONG_MSG = "010380018301830183018301830183018301830183018301830183018301830\
1830183018301830183018301830183018301830183018301830183018301830183018301830183\
0183018301830183018301830183018301830183018301830183018301830183018301830183018\
3018301830183018301830183018301830183018346e0";
describe("Modbus Ascii port", function() {
let port;
before(function() {
const mock = require("./../mocks/SerialPortMock");
mockery.resetCache();
mockery.enable({ warnOnReplace: false, useCleanCache: true, warnOnUnregistered: false });
mockery.registerMock("serialport", mock);
const AsciiPort = require("./../../ports/asciiport");
port = new AsciiPort(
"/dev/null",
{ startOfSlaveFrameChar: 0x3E } // optional slave frame char ('>')
);
});
after(function() {
mockery.disable();
});
afterEach(function() {
port.close();
});
describe("#isOpen", function() {
it("should not be open before #open", function() {
expect(port.isOpen).to.be.false;
});
it("should be open after #open", function(done) {
port.open(function() {
expect(port.isOpen).to.be.true;
done();
});
});
it("should not be open after #close", function(done) {
port.open(function() {
port.close(function() {
expect(port.isOpen).to.be.false;
done();
});
});
});
});
describe("data handler", function() {
it("should return a valid Modbus ASCII message", function(done) {
port.once("data", function(data) {
expect(data.toString("hex")).to.equal("110306ae415652434049ad");
done();
});
port.open(function() {
port.write(Buffer.from("1103006B00037687", "hex"));
setTimeout(function() {
port._client.receive(Buffer.from(">", "ascii")); // changed slave frame char
port._client.receive(Buffer.from("11", "ascii"));
port._client.receive(Buffer.from("03", "ascii"));
port._client.receive(Buffer.from("06", "ascii"));
port._client.receive(Buffer.from("AE", "ascii"));
port._client.receive(Buffer.from("41", "ascii"));
port._client.receive(Buffer.from("56", "ascii"));
port._client.receive(Buffer.from("52", "ascii"));
port._client.receive(Buffer.from("43", "ascii"));
port._client.receive(Buffer.from("40", "ascii"));
port._client.receive(Buffer.from("CC", "ascii"));
port._client.receive(Buffer.from("\r\n", "ascii"));
});
});
});
it("should return a valid Modbus ASCII exception", function(done) {
port.once("data", function(data) {
expect(data.toString("hex")).to.equal("1183044136");
done();
});
port.open(function() {
port.write(Buffer.from("1103006B00037687", "hex"));
setTimeout(function() {
port._client.receive(Buffer.from(">", "ascii"));
port._client.receive(Buffer.from("11", "ascii"));
port._client.receive(Buffer.from("83", "ascii"));
port._client.receive(Buffer.from("04", "ascii"));
port._client.receive(Buffer.from("68", "ascii"));
port._client.receive(Buffer.from("\r\n", "ascii"));
});
});
});
it("Special data package, should return a valid Modbus RTU message", function(done) {
port.once("data", function(data) {
expect(data.toString("hex")).to.equal(LONG_MSG);
done();
});
port.open(function() {
port.write(Buffer.from("010300000040443A", "hex"));
setTimeout(function() {
port._client.receive(Buffer.from(">", "ascii"));
for (let i = 0; i < (LONG_MSG.length - 4); i += 2) {
port._client.receive(Buffer.from(LONG_MSG.slice(i, i + 2), "ascii"));
}
port._client.receive(Buffer.from("7C", "ascii"));
port._client.receive(Buffer.from("\r\n", "ascii"));
});
});
});
it("Illegal start chars, should synchronize to valid Modbus ASCII message", function(done) {
port.once("data", function(data) {
expect(data.toString("hex")).to.equal("110306ae415652434049ad");
done();
});
port.open(function() {
port.write(Buffer.from("1103006B00037687", "hex"));
setTimeout(function() {
port._client.receive(Buffer.from("20", "ascii")); // illegal char
port._client.receive(Buffer.from("54", "ascii")); // illegal char
port._client.receive(Buffer.from("54", "ascii")); // illegal char
port._client.receive(Buffer.from("FF", "ascii")); // illegal char
port._client.receive(Buffer.from(">", "ascii"));
port._client.receive(Buffer.from("11", "ascii"));
port._client.receive(Buffer.from("03", "ascii"));
port._client.receive(Buffer.from("06", "ascii"));
port._client.receive(Buffer.from("AE", "ascii"));
port._client.receive(Buffer.from("41", "ascii"));
port._client.receive(Buffer.from("56", "ascii"));
port._client.receive(Buffer.from("52", "ascii"));
port._client.receive(Buffer.from("43", "ascii"));
port._client.receive(Buffer.from("40", "ascii"));
port._client.receive(Buffer.from("CC", "ascii"));
port._client.receive(Buffer.from("\r\n", "ascii"));
});
});
});
it("Illegal end chars, should return a valid Modbus ASCII message", function(done) {
port.once("data", function(data) {
expect(data.toString("hex")).to.equal("110306ae415652434049ad");
done();
});
port.open(function() {
port.write(Buffer.from("1103006B00037687", "hex"));
setTimeout(function() {
port._client.receive(Buffer.from(">", "ascii"));
port._client.receive(Buffer.from("11", "ascii"));
port._client.receive(Buffer.from("03", "ascii"));
port._client.receive(Buffer.from("06", "ascii"));
port._client.receive(Buffer.from("AE", "ascii"));
port._client.receive(Buffer.from("41", "ascii"));
port._client.receive(Buffer.from("56", "ascii"));
port._client.receive(Buffer.from("52", "ascii"));
port._client.receive(Buffer.from("43", "ascii"));
port._client.receive(Buffer.from("40", "ascii"));
port._client.receive(Buffer.from("CC", "ascii"));
port._client.receive(Buffer.from("\r\n", "ascii"));
port._client.receive(Buffer.from("20", "ascii")); // illegal char
port._client.receive(Buffer.from("54", "ascii")); // illegal char
port._client.receive(Buffer.from("54", "ascii")); // illegal char
port._client.receive(Buffer.from("FF", "ascii")); // illegal char
});
});
});
it("should return a valid Modbus ASCII message on illegal chars", function(done) {
port.once("data", function(data) {
expect(data.toString("hex")).to.equal("110306ae415652434049ad");
done();
});
port.open(function() {
port.write(Buffer.from("1103006B00037687", "hex"));
setTimeout(function() {
port._client.receive(Buffer.from(">", "ascii"));
port._client.receive(Buffer.from("11", "ascii"));
port._client.receive(Buffer.from("03", "ascii"));
port._client.receive(Buffer.from("06", "ascii"));
port._client.receive(Buffer.from("AE", "ascii"));
port._client.receive(Buffer.from("41", "ascii"));
port._client.receive(Buffer.from("56", "ascii"));
port._client.receive(Buffer.from("52", "ascii"));
port._client.receive(Buffer.from("43", "ascii"));
port._client.receive(Buffer.from("40", "ascii"));
port._client.receive(Buffer.from("CC", "ascii"));
port._client.receive(Buffer.from("\r\n", "ascii"));
});
});
});
});
describe("#write", function() {
it("should write a valid Modbus ASCII message to the port", function() {
port.write(Buffer.from("1103006B00037687", "hex"));
expect(port._client._data.toString("ascii")).to.equal(":1103006B00037E\r\n");
});
});
});