Hi. You have to use the special dealers manual which has engineers code to access programming. There is only one that I know of on the net at checkout tech https://the-checkout-tech.com/manuals/cashregisters/Uniwell_DX-890_DX-895_DX-915_TX-870_TX-875_SX-700_SX-705_SX-800_SX-805_SX-7000_SX-7505_SX-8500_SX-8505_programming_manual.html
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Hi. You have to use the special dealers manual which has engineers code to access programming. There is only one that I know of on the net at checkout tech
https://the-checkout-tech.com/manuals/cashregisters/Uniwell_DX-890_DX-895_DX-915_TX-870_TX-875_SX-700_SX-705_SX-800_SX-805_SX-7000_SX-7505_SX-8500_SX-8505_programming_manual.html