What are the restrictions for inserting data in "User tag 1 and User tag 2" fields

Document ID : KB000114944
Last Modified Date : 17/09/2018
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In the controller probe -> "Setup" tab -> "Misc." tab, there are 2 fields, "User tag 1" and "User tag 2" :

User-added image

User tags are user-defined tags which are used as a grouping and locating mechanism. The tags display in various lists in Infrastructure Manager.

What are the restrictions for inserting data in "User tag 1" and "User tag 2" fields, like maximum number of characters, special characters and spaces?
UIM 8.5.1
Controller 7.80 or later
The user tags info is recorded in UIM DB, in CM_NIMBUS_ROBOT table, inside the "user_tag_1" and "user_tag_2" columns.

These fields are defined as VARCHAR(256). So, they can accept alphanumeric characters, with a limit of 256 characters.
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