
| Pin | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
|---|---|---|---|---|---|---|---|---|
| Programing/GSM modem | +5V | +5V | +5V | TTL RxD | TTL TxD | TTL serial GPS output | GND | GND |
| Monitor | +5V | +5V | +5V | TTL TxD | - | TTL serial GPS output | GND | GND |
Pin count starts from the left side.
Using a USB 2.0 to UART TTL converter i was able to communicate with my TK-102.
This TK-102 is based on 89LE58RD MCU
When i connected pins 4&5 i was able to communicate with the GSM modem and send AT commands.
Speed: 19200bps
Here is th serial terminal output, i tried some at commands.
RDY +CFUN: 1 +CPIN: READY Call Ready ati0 SIM900B R11.0 OK ati4 SIMCOM_Ltd SIMCOM_SIM900B OK ati5 SIMCOM_Ltd
Pin 4 is also used as a TxD line and outputs something like debug/monitor information about the device.
Speed: 19200bps
AT+GMM AT+CGSN AT+CPIN? ATE1 AT+CLIP=1 AT+CMIC=0,9 AT+CLVL=4 AT+CMGF=1 AT+CNMI=2,1,0,0,0 AT+CIPHEAD=1 AT+IPR=19200;&W AT+CSQ AT+CREG? TRACKER102_AOHANG_AMERICA_2.1AT+CIPCSGP=1 AT+CIPMUX=0 AT+CIPSPRT=0 AT+CIPSTATUS AT+CSTT="gint.b-online.gr","","" AT+CBC AT+CIPSTATUS AT+CIICR AT+CIFSR AT+CIPSTART="TCP","195.134.65.135","9000" AT+CIPSHUT AT+CIPSTATUS AT+CSQ AT+CSQ AT+CSQ AT+CSQ AT+CSQ AT+CFUN=0 AT+CFUN=1 AT+CSQ AT+CSQ AT+CSQ AT+CSQ AT+CSQ AT+CFUN=0
Pin 6 outputs GPS data.
Speed: 4800bps
$GPRMC,235950.029,V,,,,,,,310307,,,N*48 $GPGGA,235951.029,,,,,0,00,,,M,0.0,M,,0000*54 $GPGSA,A,1,,,,,,,,,,,,,,,*1E $GPGSV,3,1,12,20,00,000,,10,00,000,,31,00,000,,27,00,000,*7C $GPGSV,3,2,12,19,00,000,,07,00,000,,04,00,000,,24,00,000,*76 $GPGSV,3,3,12,16,00,000,,28,00,000,,26,00,000,,29,00,000,*78