Multi-Tech Systems MT5600SMI-PL92 ユーザーズマニュアル
Appendix B – Product Approvals, Regulatory Design Considerations, and Regulatory Compliance
Multi-Tech Systems, Inc. SocketModem MT5600SMI Developer’s Guide
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5V Tolerant Inputs for 3.3V Modules
In order to drive the inputs of 3.3V modules from 5V logic, it is recommended to add a 1K series
resistor to each of the inputs: TXD, RTS, DTR, and RESET.
resistor to each of the inputs: TXD, RTS, DTR, and RESET.