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WSAL23459 – R800C GSM – GPRS HAT/en

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Documentation notice: This technical documentation was independently rewritten from an archived supplier source. Check technical details and commands against the product version and manufacturer documentation before use.

Summary

The R800C is a compact add-on board providing GSM and GPRS functionality for Raspberry Pi. It supports SMS, phone calls, data transfer via TCP/IP and HTTP. Control is through AT commands; the serial interface defaults to 115200 baud.

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Technical overview

  • Compatible with Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+/4B
  • Frequency bands: EGSM 900 / PCS 1900 MHz, quad-band auto search available
  • GSM power class 4 (2 W at 850/900 MHz) or class 1 (1 W at 1800 MHz)
  • GPRS data rate up to 85.6 kbps, coding schemes CS-1 through CS-4
  • SMS storage on SIM card; supports MT, MO, CB, text, and PDU modes
  • Serial: two ports, default baud rate 115200 bps
  • AT commands per 3GPP TS 27.007, 27.005, plus SIMCOM extensions
  • Two LEDs (PWR and NET) indicate network registration and transmission status

Commands and examples – verify before use:  

AT
ATE1
ATE0
AT+CSQ
AT+CGMR
AT+CREG?
AT+CGATT?
ATD<number>;
ATH
ATA
AT+CPIN?
AT+CLIP=1
AT+CMGF=1
AT+CMGS="<phone number>"
AT+CMGR=<index>
AT+CMGD=<index>
AT+CIPMUX=0
AT+CIPMUX=1
AT+CSTT="CMNET"
AT+CIICR

Notes and version constraints

  • Confirm network registration before attempting data transfer (AT+CREG?)
  • APN setting may vary by carrier; the example used "CMNET"
  • Transparent mode allows only a single connection; multi-link mode supports up to six connections
  • When using a third-party SIM card, verify PIN prompt and carrier parameters
  • The IP address and port values shown in the source are examples, not general configuration

Source and revision record

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