Isolated USB RS485 / RS422
author: Switching-Power
4 layer board of 1.82 x 1.08 inches (46.3 x 27.3 mm)
Uploaded:
November 13, 2017
Shared:
November 14, 2017
Total Price:
$19.50
2kV Isolated USB to RS485 or RS422
! Actual breakdown voltage is not tested !
Parts
- C1,C2 - 10µf 25V tantalum case A
- C3-C7,C9 - 100nF 0603
- C8 - 10nF 0603
- D1 - BAT54C
- IC1 - USBLC6-2SC6
- IC2 - FT230XQ
- IC3 - LTC1535 (250kBd) / MAX3535E (1000kBd) / MXL1535E (1000kBd)
- L1 - MFB-201209-0120PU Ferrite Bead
- R1 - 100kΩ 0603
- R2 - 1kΩ 0603
- R3,R4 - 100Ω 0603
- R5-R7 - 10kΩ 0603
- R8,R9 - 120Ω 0603
- T1 - IRLML6402PBF
- TR1 - P1597NL
- RS485 - RJ45 RJHSE-5085
- USB - USB B Connector
- Case - New Age Enclosures S3A-201209
Jumpers
- Slow - If closed slows the outout driver to limit the slew rate.
- TermRX - Close to enable the RX termination resistor.
- TermTX - Close to enable the TX termination resistor (only in RS422 mode).
- Duplex - Set to “F” for full for duplex RS422 or RS485 with echo or set to “H” for RS485 without echo.
- Dual 422/485 - Set both jumpers in the top position for RS422 output and in the bottom position for RS485 output.
Pinout
Similar to Ethernet so you can use standard cables. Crossover cable to connect two boards in RS422 mode. Straight cable to connect two boards in RS485 mode.
| Pin | RS422 | RS485 |
|---|---|---|
| 1 | TX+ or Y | NC |
| 2 | TX- or Z | NC |
| 3 | RX+ or A | A (Y) |
| 4 | GND | GND |
| 5 | NC | NC |
| 6 | RX- or B | B (Z) |
| 7 | NC | NC |
| 8 | GND | GND |
2kV Isolated USB to RS485 or RS422
! Actual breakdown voltage is not tested !
Parts
- C1,C2 - 10µf 25V tantalum case A
- C3-C7,C9 - 100nF 0603
- C8 - 10nF 0603
- D1 - BAT54C
- IC1 - USBLC6-2SC6
- IC2 - FT230XQ
- IC3 - LTC1535 (250kBd) / MAX3535E (1000kBd) / MXL1535E (1000kBd)
- L1 - MFB-201209-0120PU Ferrite Bead
- R1 - 100kΩ 0603
- R2 - 1kΩ 0603
- R3,R4 - 100Ω 0603
- R5-R7 - 10kΩ 0603
- R8,R9 - 120Ω 0603
- T1 - IRLML6402PBF
- TR1 - P1597NL
- RS485 - RJ45 RJHSE-5085
- USB - USB B Connector
- Case - New Age Enclosures S3A-201209
Jumpers
- Slow - If closed slows the outout driver to limit the slew rate.
- TermRX - Close to enable the RX termination resistor.
- TermTX - Close to enable the TX termination resistor (only in RS422 mode).
- Duplex - Set to “F” for full for duplex RS422 or RS485 with echo or set to “H” for RS485 without echo.
- Dual 422/485 - Set both jumpers in the top position for RS422 output and in the bottom position for RS485 output.
Pinout
Similar to Ethernet so you can use standard cables. Crossover cable to connect two boards in RS422 mode. Straight cable to connect two boards in RS485 mode.
| Pin | RS422 | RS485 |
|---|---|---|
| 1 | TX+ or Y | NC |
| 2 | TX- or Z | NC |
| 3 | RX+ or A | A (Y) |
| 4 | GND | GND |
| 5 | NC | NC |
| 6 | RX- or B | B (Z) |
| 7 | NC | NC |
| 8 | GND | GND |
