Epson TM-300AF Fiscal Printer Communication Protocol Manual

About this manual

The document explains the architecture of the Epson TM-300AF fiscal printer, including the fiscal controller, fiscal cabinet, memory modules, and the printer itself. It defines terminology such as Controlador Fiscal, Gabinete Fiscal, and Sello Fiscal, and describes how fiscal data is stored and transmitted.

It also provides step‑by‑step diagnostic tests for the firmware PROM, real‑time clock battery, work memory, fiscal memory, and printer hardware. Error messages, status‑light indications, and procedures for handling battery low‑voltage or memory failures are included. This manual is written in Spanish.

What's inside

• Terminología
• Protocolo del Host
• Interfaz de Impresora
• Estado de Impresora
• Memoria de Trabajo
• Memoria Fiscal
• Pruebas Iniciales
• Firmware PROM
• Reloj de Tiempo Real
• Prueba de Papel de la Impresora

Specifications

Frequently asked questions

What happens if the battery voltage is below 80 % of nominal?

The printer will operate for 30 days, display a low‑battery warning, and then stop functioning with a permanent low‑voltage error.

What error is shown when the work‑memory test fails?

The printer prints “ERROR EN MEMORIA RAM. LLAME AL SERVICIO TECNICO.” and stops operation.

What error is shown when the fiscal‑memory test fails?

The printer prints “ERROR EN MEMORIA FISCAL. LLAME AL SERVICIO TECNICO.” and stops operation.

How does the printer handle an open fiscal receipt after a power loss?

It automatically prints a “COMPROBANTE CANCELADO” line and increments the cancelled receipt count.

What indicates a serious error on the device?

If the STATUS/ESTADO light does not blink, it signals a serious error requiring technical service.