Difference between revisions of "UTEK UT-2127 RS-232 to RS-485 Converter"

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(added more barrel jack information)
(added wiring)
 
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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 ===
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 +
Female DE9 RS-232 pinout:
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 +
{| 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 ===
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 +
RS-485 screw terminal header:
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 +
{| 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-)
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|-
 +
| 3
 +
| RXD+
 +
| RX A+
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|
 +
|-
 +
| 4
 +
| RXD-
 +
| RX B-
 +
|
 +
|-
 +
| 5
 +
| rowspan="2" | SGND
 +
| rowspan="2" colspan="2" | GND
 +
|-
 +
| 6
 +
|}
  
 
== Bill of Materials ==
 
== Bill of Materials ==

Latest revision as of 02:34, 13 February 2024

UTEK UT-2127

Overview

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:

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:

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 SGND GND
6

Bill of Materials

Name Package Marking Description Link
U1,U4 SOIC-8 SP3485E; 1749L; T17210 half-duplex RS-485 transceiver MaxLinear SP3485EN-L
U3 SOT-23-5 L00A 3.3V ultra low dropout voltage regulator Texas Instruments LP2980AIM5-3.3
U5,U6 SOIC-14 NXP HEF4093BT; CSA59001; TXD17383 quad 2-input NAND Schmitt trigger NXP HEF4093BT,652
U7 SOIC-8 [Top Power ASIC logo] TP7660; 1749H voltage converter Chinese datasheet
R1,R3,R7 0603 472
R4,R8,R9 0603 472
R5,R6 0603 122
C3 226C; 83EH0
C2,C5,C6 106C; 20EH4
C1,C4,C7,C10,C11,C12 0603
C8, C9 "B" size 106C; 10FN0
Q2,Q3,Q4,Q6 SOT-23 C3
Q1,Q5 SOT-23 M6
D1,D2 ? M4
ZD1,ZD22,ZD4,ZD5 [B logo] C803; AK
ZD3 SS24
JP1 ZHONGB; ZB126; 300V 10A; CE 20-14 AWG (Ningbo Zhongbo Photovoltaic Technology Co., LTD) 6-position 5.0mm pitch screw terminal block datasheet datasheet (alt)
JP2 female DE-9 solder cup connector (PCB mounted though!)
JP3 GongKin DC-002-⌀1.0 small (4.2mm OD, 1.0mm ID) DC barrel jack mating with a 3.5x1.35mm plug 深圳市冈琦电子有限公司
T1 UTEK 05S05S-W1

Online Resources

RS-232 to RS-485/422 Port-Powered Lightning Converter with Optical Isolation

User Manual

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