UTEK UT-2127 RS-232 to RS-485 Converter

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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