thank for your help
The flow is:[{"id":"5d5ef21b.a6885c","type":"tab","label":"ReaderInputs","disabled":false,"info":""},{"id":"310a6d52.150c22","type":"inject","z":"5d5ef21b.a6885c","name":"SetReadMode","topic":"","payload":"{MVERRR}","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":230,"y":160,"wires":[["705398bf.ccbc08","edee5b23.ef03a8"]]},{"id":"edee5b23.ef03a8","type":"debug","z":"5d5ef21b.a6885c","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":890,"y":160,"wires":[]},{"id":"705398bf.ccbc08","type":"serial request","z":"5d5ef21b.a6885c","name":"SendAndRequest","serial":"a7dbf2e6.98de5","x":590,"y":80,"wires":[["edee5b23.ef03a8"]]},{"id":"a7dbf2e6.98de5","type":"serial-port","z":"","serialport":"/dev/ttyUSB0","serialbaud":"9600","databits":"8","parity":"none","stopbits":"1","waitfor":"","dtr":"none","rts":"none","cts":"none","dsr":"none","newline":"\\n","bin":"false","out":"char","addchar":"","responsetimeout":"10000"}]