Only pins required are TXD and RXD (along with VCC and GND of course), but for flexibility, connect also Config, Reset and CTS (for larger packages and flow control required).
Last Update: August 8, 2017
January 25, 2017
2036
RC232 Q&A Related Knowledge Base Posts - [RC232] When the MAC layer has a packet to send, it will use a carrier-sense-multiple-access (CSMA) protocol to determine if another module is already transmitting. If another module is transmitting, the module will receive that data before attempting to transmit its data again. If, during this process, the UART receive buffer gets full, the CTS line will go high to prevent the host UART from over-running the receive buffer. The CSMA mechanism introduces a variable delay to the transmission channel. This delay is the sum of a random period and a weighted period that is dependent on the number of times that the module has tried and failed to acquire the channel. For applications that guarantee that only one module will be transmitting at any given time, the CSMA mechanism can be turned off to avoid this delay. [RC232] The MAX input power is 10dBm. What appen if the module receive a greater power? Just the signal make worse or the module could be damaged? In case could you suggest a protection circuit? [RC232] When I connect RXEN and TXEN to VDD, instead of leaving open, the current consumption increases to 20, mA. When I send a character to the module over RS232, the current appears to be 134mA.
