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The TX LED flash means GPS module output normally. The LED flash means GPS module locate your place. Data level: TTL or -232, default TTL level. To be RS232 output, you need to use one TTL to RS232 converter cable. This BN-220 GPS Module using the latest 10th generation chip When you use it for , there is no driver Here is connection with RPi, red to 3.3v, black to gnd, green to txd, white to rxd. This BN-220 GPS Module has 4M Flash to save configuration, so you do not need to reset data next time when you use it. Baud rate: 4800bps to 921600bps, default 38400bps.