I amended the title for help with applying an Arduino sketch which is my next step. Does anyone know of any good examples out there with multiple Arduinoās on RS485 with remote sensors and/or relays? Below the Master and Slave sketches that I loaded before and seemed to work. Iāve googled around, but unfortunately my sketch knowledge is very limited 
Any pointers or even general directions appreciated!
Master:
/* YourDuino SoftwareSerialExample1
- Connect to another Arduino running "YD_SoftwareSerialExampleRS485_1Remote"
- Connect this unit Pins 10, 11, Gnd
- Pin 3 used for RS485 direction control
- To other unit Pins 11,10, Gnd (Cross over)
- Open Serial Monitor, type in top window.
- Should see same characters echoed back from remote Arduino
Questions: terry@yourduino.com
*/
/*-----( Import needed libraries )-----*/
#include <SoftwareSerial.h>
/*-----( Declare Constants and Pin Numbers )-----*/
#define SSerialRX 10 //Serial Receive pin
#define SSerialTX 11 //Serial Transmit pin
#define SSerialTxControl 3 //RS485 Direction control
#define RS485Transmit HIGH
#define RS485Receive LOW
#define Pin13LED 13
/*-----( Declare objects )-----*/
SoftwareSerial RS485Serial(SSerialRX, SSerialTX); // RX, TX
/*-----( Declare Variables )-----*/
int byteReceived;
int byteSend;
void setup() /****** SETUP: RUNS ONCE ******/
{
// Start the built-in serial port, probably to Serial Monitor
Serial.begin(9600);
Serial.println("YourDuino.com SoftwareSerial remote loop example");
Serial.println("Use Serial Monitor, type in upper window, ENTER");
pinMode(Pin13LED, OUTPUT);
pinMode(SSerialTxControl, OUTPUT);
digitalWrite(SSerialTxControl, RS485Receive); // Init Transceiver
// Start the software serial port, to another device
RS485Serial.begin(4800); // set the data rate
}//--(end setup )---
void loop() /****** LOOP: RUNS CONSTANTLY ******/
{
digitalWrite(Pin13LED, HIGH); // Show activity
if (Serial.available())
{
byteReceived = Serial.read();
digitalWrite(SSerialTxControl, RS485Transmit); // Enable RS485 Transmit
RS485Serial.write(byteReceived); // Send byte to Remote Arduino
digitalWrite(Pin13LED, LOW); // Show activity
delay(10);
digitalWrite(SSerialTxControl, RS485Receive); // Disable RS485 Transmit
}
if (RS485Serial.available()) //Look for data from other Arduino
{
digitalWrite(Pin13LED, HIGH); // Show activity
byteReceived = RS485Serial.read(); // Read received byte
Serial.write(byteReceived); // Show on Serial Monitor
delay(10);
digitalWrite(Pin13LED, LOW); // Show activity
}
}//--(end main loop )---
/*-----( Declare User-written Functions )-----*/
//NONE
//*********( THE END )***********
Slave / Remote:
/* YourDuino SoftwareSerialExample1Remote
- Used with YD_SoftwareSerialExampleRS485_1 on another Arduino
- Remote: Receive data, loop it back...
- Connect this unit Pins 10, 11, Gnd
- To other unit Pins 11,10, Gnd (Cross over)
- Pin 3 used for RS485 direction control
- Pin 13 LED blinks when data is received
Questions: terry@yourduino.com
*/
/*-----( Import needed libraries )-----*/
#include <SoftwareSerial.h>
/*-----( Declare Constants and Pin Numbers )-----*/
#define SSerialRX 10 //Serial Receive pin
#define SSerialTX 11 //Serial Transmit pin
#define SSerialTxControl 3 //RS485 Direction control
#define RS485Transmit HIGH
#define RS485Receive LOW
#define Pin13LED 13
/*-----( Declare objects )-----*/
SoftwareSerial RS485Serial(SSerialRX, SSerialTX); // RX, TX
/*-----( Declare Variables )-----*/
int byteReceived;
int byteSend;
void setup() /****** SETUP: RUNS ONCE ******/
{
// Start the built-in serial port, probably to Serial Monitor
Serial.begin(9600);
Serial.println("SerialRemote"); // Can be ignored
pinMode(Pin13LED, OUTPUT);
pinMode(SSerialTxControl, OUTPUT);
digitalWrite(SSerialTxControl, RS485Receive); // Init Transceiver
// Start the software serial port, to another device
RS485Serial.begin(4800); // set the data rate
}//--(end setup )---
void loop() /****** LOOP: RUNS CONSTANTLY ******/
{
//Copy input data to output
if (RS485Serial.available())
{
byteSend = RS485Serial.read(); // Read the byte
digitalWrite(Pin13LED, HIGH); // Show activity
delay(10);
digitalWrite(Pin13LED, LOW);
digitalWrite(SSerialTxControl, RS485Transmit); // Enable RS485 Transmit
RS485Serial.write(byteSend); // Send the byte back
delay(10);
digitalWrite(SSerialTxControl, RS485Receive); // Disable RS485 Transmit
// delay(100);
}// End If RS485SerialAvailable
}//--(end main loop )---
/*-----( Declare User-written Functions )-----*/
//NONE
//*********( THE END )***********
In the examples above from https://arduino-info.wikispaces.com/SoftwareSerialRS485Example it seems these sketches apply to two arduinoās chatting with each other but I donāt see anything identifying how to addresses more than twoā¦ with identifiers for each, much less read a remote sensorā¦ Iāll try to add another Nano or the Mega this evening time permitting and have a 100 meter roll of 22awg Cat7 ordered for further testingā¦ Plenty of sensors and relays on hand 
Again any help with appropriate sketches appreciated! Thanks!!
