STRING v/s Hex-STRING

Hi,

 I am querying a variable (OID) which has type/syntax as SnmpAdminString.

 My agent, for some reason, returning binary values, whereas it should have
been a displayable-string.

 When I query the variable I get output with junk character like
'OoN.Í?-tP�l.YaM�'.

 Can any one please tell me is there way to instruct NetSNMP to format
non-displayable characters as Hex-STRING?

I tried configuring following in snmp.conf - but no luck.
printHexText 1
noDisplayHint 1


thanks
chinmaya