- 42 - © 2018 unitech Electronics Co., Ltd. All rights reserved.unitech is a registered trademark of unitech Electronics Co., Ltd.MS652 User’s Manual3.3 Code 393.3.1 Code 128 Reduced Quiet ZoneScan one of the following bar codes to enable or disable Code 39.3.3.2 Trioptic Code 39Trioptic Code 39 is a variant of Code 39 used in the marking of computertape cartridges. Trioptic Code 39 symbols always contain six characters.Scan one of the following bar codes to enable or disable Trioptic Code 39.NOTE: You cannot enable Trioptic Code 39 and Code 39 Full ASCII simultaneously.Enable Code 39*Disable Code 39Enable Trioptic Code 39Disable Trioptic Code 39*