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MOD-GSM-EDGE

850/900/1800/1900 MHz GSM module to add GSM connectivity to development boards with UEXT connector

https://www.olimex.com/Products/Modules/RF/MOD-GSM-EDGE/

MOD-GSM-EDGE allow every OLIMEX's board with UEXT connector to have GSM 4 band 850/900/1800/1900 MHz connectivity \
Data throughput up to 236 Kbps in Edge mode
Uses SIM700D GSM module
PCB: FR-4, 1.5 mm (0,062"), soldermask, white silkscreen component print
Dimensions: 79x59 mm (3.12 x 2.3")

MOD-GSM doesn't transmit properly data on the UEXT of another Olimex board. Where is the problem?
You might need to cut the UEXT cable connecting the MOD-GSM with the board so that the only data call signals left, are the ones that refer to MOD-GSM with DUINOMITE boards (CTS is held at a high position, which means it will not send data). Keep in mind that some other boards can also interfere with MOD-GSM's signals. If the host board has any signal on the I2C and/or the SPI on the UEXT, there is a very high chance of erroneous behaviour.

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