i just recieved my first m-duino , seems impressive. Now i'm going trought the docs and sample codes to get my hardware se tup ready, but i have found out that Modbus and the GPRS/GSM module both seem to be using Serial1 . This PLC will have 2 Modbus sensors attached so i need a pretty constant connection to them. Is there a way to use both devices (modbus and the gsm) ? The SMS will only be used incase an error or alarm occurs so i could pause the modbus reading and connect to the GSM module , just to send the SMS and then re-activate the Modbus. Am i seeing this the wrong way ?