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UTEK UT-2127 RS-232 to RS-485 Converter (view source)
Revision as of 02:34, 13 February 2024
, 13 Februaryadded wiring
Isolated (supposedly optically) RS-232 to RS-485 converter, useful for controlling VFD's over half-duplex Modbus, though the converter supports full duplex.
Isolated (supposedly optically) RS-232 to RS-485 converter, useful for controlling VFD's over half-duplex Modbus, though the converter supports full duplex.
== Wiring Diagram ==
=== RS-232 ===
Female DE9 RS-232 pinout:
{| class="wikitable"
! DE9 Pin
! Function
! Direction
! Note
|-
| 1
| PGND
| PC ↔ device
| normally DCD
|-
| 2
| RXD
| PC ← device
|
|-
| 3
| TXD
| PC → device
|
|-
| 4
| DTR
| PC → device
|
|-
| 5
| GND
| PC ↔ device
|
|-
| 6
| DSR
| PC ← device
|
|-
| 7
| RTS
| PC → device
|
|-
| 8
| CTS
| PC ← device
|
|-
| 9
| RI
| PC ← device
|
|}
=== RS-485 ===
RS-485 screw terminal header:
{| class="wikitable"
! Pin
! Name
! RS-422 Function
! RS-485 Function
|-
| 1
| T/R+
| TX A+
| RS-485 (A+)
|-
| 2
| T/R-
| TX B-
| RS-485 (B-)
|-
| 3
| RXD+
| RX A+
|
|-
| 4
| RXD-
| RX B-
|
|-
| 5
| rowspan="2" | SGND
| rowspan="2" colspan="2" | GND
|-
| 6
|}
== Bill of Materials ==
== Bill of Materials ==