@zandor300/jsmodbus
Version:
Implementation for the Serial/TCP Modbus protocol.
64 lines (63 loc) • 1.89 kB
JavaScript
;
var __importDefault = (this && this.__importDefault) || function (mod) {
return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.isReadDiscreteInputsRequestBody = isReadDiscreteInputsRequestBody;
const codes_1 = require("../codes");
const request_body_js_1 = __importDefault(require("./request-body.js"));
class ReadDiscreteInputsRequestBody extends request_body_js_1.default {
get start() {
return this._start;
}
get count() {
return this._count;
}
get name() {
return 'ReadDiscreteInput';
}
get byteCount() {
return 5;
}
static fromBuffer(buffer) {
try {
const fc = buffer.readUInt8(0);
if (fc !== codes_1.FC.READ_DISCRETE_INPUT) {
return null;
}
const start = buffer.readUInt16BE(1);
const quantity = buffer.readUInt16BE(3);
return new ReadDiscreteInputsRequestBody(start, quantity);
}
catch (e) {
return null;
}
}
constructor(start, count) {
super(codes_1.FC.READ_DISCRETE_INPUT);
if (start > 0xFFFF) {
throw new Error('InvalidStartAddress');
}
if (count > 0x7D0) {
throw new Error('InvalidQuantity');
}
this._start = start;
this._count = count;
}
createPayload() {
const payload = Buffer.alloc(5);
payload.writeUInt8(this._fc, 0);
payload.writeUInt16BE(this._start, 1);
payload.writeUInt16BE(this._count, 3);
return payload;
}
}
exports.default = ReadDiscreteInputsRequestBody;
function isReadDiscreteInputsRequestBody(x) {
if (x instanceof ReadDiscreteInputsRequestBody) {
return true;
}
else {
return false;
}
}