# ModbusFlexGetter - Override unitid

**URL:** <https://discourse.nodered.org/t/modbusflexgetter-override-unitid/21694>\
**Category:** Industrial\
**Created:** [14 February 2020 12:18 UTC](https://discourse.nodered.org/t/modbusflexgetter-override-unitid/21694 "2020-02-14T12:18:36Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![LTDS](https://avatars.discourse-cdn.com/v4/letter/l/3be4f8/32.png) [@LTDS](https://discourse.nodered.org/u/LTDS)\
**Post date:** [14 February 2020 12:18 UTC](https://discourse.nodered.org/t/modbusflexgetter-override-unitid/21694/1 "2020-02-14T12:18:37Z")

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Hi !  
I'm having issues to override the value of the unitid in the ModbusFlexGetter node using the function node.

Here is my flow :

[{"id":"2dec2833.200ce","type":"tab","label":"Flow 2","disabled":false,"info":""},{"id":"20c38ef2.180982","type":"inject","z":"2dec2833.200ce","name":"","topic":"","payload":"","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":150,"y":120,"wires":[["3411cd12.0d4662"]]},{"id":"3411cd12.0d4662","type":"function","z":"2dec2833.200ce","name":"","func":" msg.payload = \n {\n 'fc': 3,\n 'unitid': 14,\n 'address': 164,\n 'quantity': 1\n };\n return msg;","outputs":1,"noerr":0,"x":280,"y":120,"wires":[["e6f95e2c.4859e8"]]},{"id":"e6f95e2c.4859e8","type":"modbus-flex-getter","z":"2dec2833.200ce","name":"","showStatusActivities":false,"showErrors":false,"logIOActivities":false,"server":"e3663c5a.c8ea4","useIOFile":false,"ioFile":"","useIOForPayload":false,"x":450,"y":120,"wires":[["b814c14b.23a188"],]},{"id":"b814c14b.23a188","type":"modbus-response","z":"2dec2833.200ce","name":"","registerShowMax":20,"x":670,"y":120,"wires":},{"id":"e3663c5a.c8ea4","type":"modbus-client","z":"","name":"","clienttype":"serial","bufferCommands":true,"stateLogEnabled":false,"tcpHost":"127.0.0.1","tcpPort":"502","tcpType":"DEFAULT","serialPort":"/dev/ttyUSB0","serialType":"RTU-BUFFERD","serialBaudrate":"9600","serialDatabits":"8","serialStopbits":"2","serialParity":"none","serialConnectionDelay":"100","unit\_id":"10","commandDelay":"1","clientTimeout":"1000","reconnectOnTimeout":true,"reconnectTimeout":"2000","parallelUnitIdsAllowed":true}]

I thought it was possible but is it really ?  
Or what do I do wrong ?

Thanks !!  
Nico

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [14 April 2020 15:28 UTC](https://discourse.nodered.org/t/modbusflexgetter-override-unitid/21694/3 "2020-04-14T15:28:12Z")

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