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WIP: Implements reading ability for PLC-5 #33

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WIP: Implements reading ability for PLC-5 #33

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56 changes: 54 additions & 2 deletions nodePCCC.js
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Original file line number Diff line number Diff line change
Expand Up @@ -38,13 +38,25 @@ var silentMode = false;

module.exports = NodePCCC;

/**
*
* @param {object} [opts]
* @param {boolean} [opts.silent=false] supress all logging
* @param {boolean} [opts.debug] logs debug messages
* @param {string} [opts.commandSet="SLC"] the command set used to communicate with the PLC. Possible values are "SLC" and "PLC-5/ASCII"
*/
function NodePCCC(opts){
var self = this;

opts = opts || {};
silentMode = opts.silent || false;
effectiveDebugLevel = opts.debug ? 99 : 0;

self.commandSet = opts.commandSet || "SLC";
if (self.commandSet !== "SLC" && self.commandSet !== "PLC-5/ASCII") {
throw new Error("Unsupported command set: " + self.commandSet);
}

self.connectReq = new Buffer([0x65,0x00,0x04,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x00,0x0a,0x0b,0x0c,0x0d,0x0e,0x0f,0x0a,0x0b,0x00,0x00,0x00,0x00,0x01,0x00,0x00,0x00]);

// This header is used to assemble a read packet.
Expand Down Expand Up @@ -131,6 +143,7 @@ NodePCCC.prototype.initiateConnection = function (cParam, callback) {
if (cParam === undefined) { cParam = {port: 44818, host: '192.168.8.106'}; }
outputLog('Initiate Called - Connecting to PLC with address and parameters:');
outputLog(cParam);
outputLog('Using command set: ' + self.commandSet);
if (typeof(cParam.name) === 'undefined') {
self.connectionID = cParam.host;
} else {
Expand Down Expand Up @@ -899,9 +912,16 @@ NodePCCC.prototype.sendReadPacket = function() {

// The FOR loop is left in here for now, but really we are only doing one request per packet for now.
for (j = 0; j < self.readPacketArray[i].itemList.length; j++) {
returnedBfr = SLCAddrToBufferA2(self.readPacketArray[i].itemList[j], false);
switch(self.commandSet){
case "PLC-5/ASCII":
returnedBfr = SLCAddrToBuffer01(self.readPacketArray[i].itemList[j], false);
break;
case "SLC":
default:
returnedBfr = SLCAddrToBufferA2(self.readPacketArray[i].itemList[j], false);
}

outputLog('The A2 Returned Buffer is:',2);
outputLog('The returned read buffer is:',2);
outputLog(returnedBfr, 2);
outputLog("The returned buffer length is " + returnedBfr.length, 2);

Expand Down Expand Up @@ -2049,6 +2069,38 @@ function isQualityOK(obj) {
return true;
}

function SLCAddrToBuffer01(addrinfo, isWriting) {
// Word range read, for PLC-5 and PLC-5/250

var addr = addrinfo.addr;
var bufLen = 10 + addr.length;
var readLen = addrinfo.byteLength;
readLen += (readLen % 2); //rounds up for the number of words

var buffer = new Buffer(bufLen);
var ptr = 0;

//FNC Word Range Read
buffer.writeUInt8(0x01, ptr);
ptr += 1;
// packet offset
buffer.writeUInt16LE(0, ptr);
ptr += 2;
// total transaction (number of words)
buffer.writeUInt16LE(readLen / 2, ptr);
ptr += 2;
// PLC-5 address
buffer.writeUInt8(0, ptr++);
buffer.writeUInt8(0x24, ptr++); // '$'
buffer.write(addr, ptr, 'ascii');
ptr += addr.length;
buffer.writeUInt8(0, ptr++);
// size (number of bytes)
buffer.writeUInt8(readLen, ptr);

return buffer;
}

function SLCAddrToBufferA2(addrinfo, isWriting) {
// OK - this buffer is for message type 91, that works for the ENI but for nothing else. . var thisBitOffset = 0, theReq = new Buffer([0x91,0x00,0x09,0x00,0x0f,0x00,0x1e,0x07,0xa2,0x02,0x07,0x89,0x00]); // Example used a1 instead of a2. But a1 is not a documented DF1 command. A2 is. See DF1 manual.
var thisBitOffset = 0;
Expand Down