Technical Support Tool Kit — Connection Guide

For the DLA80-485DA 4G DTU  ·  After-sales diagnostics & DTU data passthrough testing
4G DTU
SUPPORT TOOL

Overall Connection Diagram

Connect the required lead(s) to the 9-pin terminal block according to the test task. All four leads can be connected simultaneously.
PC / Laptop DTU configuration & debug console RS232 Device Device under test (D-sub COM port) RS485 Device under Test Field bus wiring: A+ / B− DC 9–25V Power Adapter Observe polarity: red DC+ / black DC− DEBUG · RX TX USB-A RS232 · TXD RXD RS485 · red = A+ · black = B− DC 9–25V G G B− A+ DC− DC+ 01 RX 02 TX 03 TXD 04 RXD 05 G 06 B− 07 A+ 08 DC− 09 DC+ DLA80-485DA · 4G DTU DLA80-485DA 4G DTU 4G POWER WORK NET LINK

Pin Definition — 9-pin Terminal Block

Pin numbering follows the DLA80-485DA product documentation.
DLA80-485DA 010203040506070809
Signal RXTXTXDRXDGB−A+DC−DC+
RX Debug-RX interface of the device
TX Debug-TX interface of the device
TXD RS232 signal, device output
RXD RS232 signal, device input
G Power ground
B− RS485 signal B−
A+ RS485 signal A+
DC− Negative power supply (power ground)
DC+ Positive power supply, DC 9–25V

PC-Side Test Adapters — Simulating Terminal Signals

Two accessory cables allow a PC to emulate the terminal device, so the full DTU passthrough chain can be verified on a bench without external equipment.
PC / Laptop Runs the terminal-emulation tool and generates test data USB-A USB-A RS232-to-USB Adapter Plugs onto the RS232 lead (DB9) — PC simulates an RS232 terminal (TXD / RXD / G) USB-A USB-A RS485-to-USB Adapter Connects the RS485 lead (A+ / B−) — PC simulates an RS485 terminal

Quick Start — DTU Data Passthrough Test

Typical use of this tool kit by technical support engineers.
1

Power on

Connect the DC lead to a DC 9–25V adapter (red = DC+, black = DC−). The POWER LED turns on; NET indicates 4G network registration.

2

Configure

Plug the DEBUG USB cable into a PC. Open a serial terminal to configure network and serial parameters of the DTU.

3

Connect device under test

Attach the RS232 lead (TXD / RXD / G, DB9) or the RS485 lead (A+ red / B− black) to the device under test — or to a PC via the RS232-to-USB / RS485-to-USB adapter to simulate the terminal signals.

4

Verify passthrough

Send data from the serial side and confirm it is delivered over the 4G network — and vice versa.

Technical support tool kit for the DLA80-485DA 4G DTU · Wire colors: red = A+ / DC+, black = B− / DC− · Pin 05 (G) is the power ground reference.
For after-sales diagnostics and DTU data passthrough testing only.