# Modbus ON-Line / OFF-line status
**URL:** https://discourse.nodered.org/t/modbus-on-line-off-line-status/24813
**Category:** General
**Created:** [14 April 2020 14:09 UTC](https://discourse.nodered.org/t/modbus-on-line-off-line-status/24813 "2020-04-14T14:09:37Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@farcry](https://discourse.nodered.org/u/farcry)
#### Post date: [14 April 2020 14:09 UTC](https://discourse.nodered.org/t/modbus-on-line-off-line-status/24813/1 "2020-04-14T14:09:37Z")
Hello.
I would like to monitor the OFFLINE status of Modbus device.
For now I'm using SERIAL comunication.
If the device is OFFLINE I would lit RED LIGHT.
If it is ONLINE the light would be GREEN.
I tried with STATUS (link below), but if device goes OFFLINE the function does not execute...
>
How can I show OFFLINE status?
Thanks.
---
### Author:  [@farcry](https://discourse.nodered.org/u/farcry)
#### Post date: [14 April 2020 14:38 UTC](https://discourse.nodered.org/t/modbus-on-line-off-line-status/24813/2 "2020-04-14T14:38:05Z")
I have figured out.
For now I use simple function (connected to button):
var status = msg.status.text;
var error = false;
msg = {};
if(status.indexOf('active') == -1){
msg.background = "RED"; //COMM ERROR
}
else{
msg.background = "GREEN"; //COMM OK
}
return msg;
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [13 June 2020 14:38 UTC](https://discourse.nodered.org/t/modbus-on-line-off-line-status/24813/3 "2020-06-13T14:38:14Z")
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