# ZigBee static ttyUSB

**URL:** <https://community.openhab.org/t/zigbee-static-ttyusb/56842>\
**Category:** Bindings\
**Created:** [November 15, 2018, 10:10pm UTC](https://community.openhab.org/t/zigbee-static-ttyusb/56842 "2018-11-15T22:10:37Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![AndreasBrett](https://community.openhab.org/letter_avatar_proxy/v4/letter/a/5fc32e/32.png) [@AndreasBrett](https://community.openhab.org/u/AndreasBrett)\
**Post date:** [November 17, 2018, 4:04pm UTC](https://community.openhab.org/t/zigbee-static-ttyusb/56842/2 "2018-11-17T16:04:10Z")

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Have you added the static ttyUSB:\_ZigBee port to EXTRA\_JAVA\_OPTS in /etc/default/openhab2 ?

openHAB can only use ports that are defined in there. Check this article:

> [@Zigbee binding](https://community.openhab.org/t/zigbee-binding/15763/100):
>
> Ah, I see, thanks for clarifying. Since I use openHABian on my “developement/test”-RasPI-system, I’ve probably not stumbled over this serial permission issue. Another idea is to check: /etc/default/openhab2 to permit the required serial port, similar to: EXTRA\_JAVA\_OPTS="-Dgnu.io.rxtx.SerialPorts=/rdev/zwave:/rdev/rfxcom"

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_[View the full topic](https://community.openhab.org/t/zigbee-static-ttyusb/56842)._