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Module 4P Terminal side:
VCC: + 3.3V
TXD : The module's TTL (UART) to send, connected to the microcontroller's RXD receiver pin;
RXD : The module's TTL (UART) receiver, connected to the microcontroller TXD send pin;
GND : The module ground wire (this wire must be connected with the ground wire of microcontroller system);
Module 5P Terminal side:
R + / A : A-Pin of this module, connected to T + / Y pin of other 422 modules;
R- / B : B-Pin of this module, connected toT- / Z pin of other 422 modules;
T- / Z -: Z-Pin of this module, connected to R- / B of other 422 modules;
T + / Y : Y-Pin of this module, connected to R + / A pin of other 422 modules;
GND : Ground wire;
Package Included:
1xRS422 to TTL / UART / MCU Serial Port Signal Mutual Conversion Module
Rick Mcneely
2025-08-30 20:49:38
I like the fact that these have screw terminals. These particular terminals aren't great with fine wires which seems odd but still worked fine for me. I use them to extend serial communications for very long distances.
Tobiah Howell
2025-04-04 21:03:39
I bought a few of these moduals for a project that needed to transmit data in a noisy environment. After I attached the modual using the labels on the board, nothing worked. The TX light lit up as the data was sent, but the RX light on the other end never lit up. Only after hours of testing, buying additional moduals, and more testing did I realize that the labels on the board are wrong. TXD is not transmit, it is receive, and RXD is not receive, it is transmit. Even the indicator LEDs are labeled wrong. After switching the wires around, it worked fantastically, but I can't get back the hours spent testing the chips due to a simple labeling mistake. I hope this helps anyone who is having issues with this device and others like it.
U01
2024-12-13 11:35:46
This does not work over any serious length of cable, which is the main selling point of RS422/RS485. It uses the 3.3v voltage it receives to attempt to make a "faux" RS422 signal. If your going next to higher voltage or down any length of cable, just don't bother. Buy a different converter and save the trouble.
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