Hardware Design SIM800L (SIMCom) - 31
| Manufacturer | SIMCom |
| Description | Quad-band GSM/GPRS module, that works on frequencies GSM850MHz, EGSM900MHz, DCS1800MHz and PCS1900MHz |
| Pages / Page | 70 / 31 — Smart Machine Smart Decision MODULE( DCE) CUSTOMER (DTE). Serial port … |
| Revision | 1.09 |
| File Format / Size | PDF / 2.8 Mb |
| Document Language | English |
Smart Machine Smart Decision MODULE( DCE) CUSTOMER (DTE). Serial port Serial port. TXD TXD RXD. RTS. CTS. UART _ DTR
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Smart Machine Smart Decision MODULE( DCE) CUSTOMER (DTE)
Serial port Serial port
TXD TXD RXD
RTS
CTS
UART _ DTR
UART _ DCD RXD
RTS
CTS
DTR
DCD UART1_RI RING Figure 19: Connection of the serial interfaces If the voltage of UART is 3.3V, the following reference circuits are recommended. If the voltage is 3.0V, please
change the resistors in the following figure from 5.6K to 14K. Figure 20: Resistor matching circuit
If the voltage of UART is 3V or3.3V, the following reference circuits are recommended: SIM800L_Hardware_Design_V1.00 31 2013-08-20
Serial port Serial port
TXD TXD RXD
RTS
CTS
UART _ DTR
UART _ DCD RXD
RTS
CTS
DTR
DCD UART1_RI RING Figure 19: Connection of the serial interfaces If the voltage of UART is 3.3V, the following reference circuits are recommended. If the voltage is 3.0V, please
change the resistors in the following figure from 5.6K to 14K. Figure 20: Resistor matching circuit
If the voltage of UART is 3V or3.3V, the following reference circuits are recommended: SIM800L_Hardware_Design_V1.00 31 2013-08-20
