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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.<br />
<br />
== Summary ==<br />
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.<br />
<br />
== Related products at JW Tech ==<br />
* [https://shop.jw-tech.eu/p/WSAL23459 WSAL23459 – R800C GSM/GPRS HAT For Raspberry Pi]<br />
<br />
== Technical overview ==<br />
* Compatible with Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+/4B<br />
* Frequency bands: EGSM 900 / PCS 1900 MHz, quad-band auto search available<br />
* GSM power class 4 (2 W at 850/900 MHz) or class 1 (1 W at 1800 MHz)<br />
* GPRS data rate up to 85.6 kbps, coding schemes CS-1 through CS-4<br />
* SMS storage on SIM card; supports MT, MO, CB, text, and PDU modes<br />
* Serial: two ports, default baud rate 115200 bps<br />
* AT commands per 3GPP TS 27.007, 27.005, plus SIMCOM extensions<br />
* Two LEDs (PWR and NET) indicate network registration and transmission status<br />
<br />
'''Commands and examples – verify before use:''' <br />
<syntaxhighlight lang="text"><br />
AT<br />
ATE1<br />
ATE0<br />
AT+CSQ<br />
AT+CGMR<br />
AT+CREG?<br />
AT+CGATT?<br />
ATD<number>;<br />
ATH<br />
ATA<br />
AT+CPIN?<br />
AT+CLIP=1<br />
AT+CMGF=1<br />
AT+CMGS="<phone number>"<br />
AT+CMGR=<index><br />
AT+CMGD=<index><br />
AT+CIPMUX=0<br />
AT+CIPMUX=1<br />
AT+CSTT="CMNET"<br />
AT+CIICR<br />
</syntaxhighlight><br />
<br />
== Notes and version constraints ==<br />
* Confirm network registration before attempting data transfer (AT+CREG?)<br />
* APN setting may vary by carrier; the example used "CMNET"<br />
* Transparent mode allows only a single connection; multi-link mode supports up to six connections<br />
* When using a third-party SIM card, verify PIN prompt and carrier parameters<br />
* The IP address and port values shown in the source are examples, not general configuration<br />
<br />
== Source and revision record ==<br />
* [https://www.waveshare.com/wiki/R800C_GSM/GPRS_HAT R800C GSM/GPRS HAT - Waveshare Wiki]<br />
* Source revision: 90947<br />
* Captured: 2026-09-04T03:01:53+00:00<br />
* SHA-256: <code>8e9cc14a9ddd254662d6e1e7cd2679fd372bc119ff8ffb425986f2c8a8996c72</code></div>JWTechPublisher