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| radios:tait_tm8200 [2023/06/06 21:55] – [Programming] 2e0sip | radios:tait_tm8200 [2023/06/06 21:55] – 2e0sip |
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| ====== Programming Cable ====== | ====== Programming Cable ====== |
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| ===== Programming Cable ===== | |
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| It was previously understood that the TM8XXX series required inverted 3.3v serial in order to program them, however the "Computer-Controlled Data Interface (CCDI) Protocol Manual" shows that the serial Rx line is RS232 level compatible. A tear down of a commercially sold programming cable also revealed a MAX232 type chip, confirming the radios can tolerate high levels than 3.3v. This means that instead of trying to find an invertable, 3.3v serial adapter, you can just adapt an RS232 cable to the pinout of the radio assuming it'll work with receiving the lower voltages. Fortunately Most modern USB to RS232 adapters will work fine. | It was previously understood that the TM8XXX series required inverted 3.3v serial in order to program them, however the "Computer-Controlled Data Interface (CCDI) Protocol Manual" shows that the serial Rx line is RS232 level compatible. A tear down of a commercially sold programming cable also revealed a MAX232 type chip, confirming the radios can tolerate high levels than 3.3v. This means that instead of trying to find an invertable, 3.3v serial adapter, you can just adapt an RS232 cable to the pinout of the radio assuming it'll work with receiving the lower voltages. Fortunately Most modern USB to RS232 adapters will work fine. |
