SNMP Text values are shown as HEXA values when contains non-english characters (non ASCII7 I suppose)
Example:
SNMP Message gathered from printer "imprimiendo página 1/1..."  (contains "á") is shown as HEXA values. 

Steps to reproduce:

1. Create new SNMP item type TEXT in host for, lets say, OID 1.3.6.1.2.1.43.16.5.1.2.1.1
2. get value that has non english character
3. See value on Latest data for host

Result:
When text have a non english character is shown as HEXA values instead of TEXT 

Expected:
ASCII Text should be shown always as text (NO HEXA values) 

In attachment image with configuration of item and error. 

More info in:
https://www.zabbix.com/forum/zabbix-help/393854-printer-s-display-message-status-using-snmp-sometimes-shows-message-as-hexa-values <- in English
https://www.zabbix.com/forum/em-portugues-y-en-espanol/35348-compartilhando-template-impressora-brother?p=395136#post395136 <- in Spanish