E-Lins H685m Series Manual do Utilizador descarregar pdf (Página 97)

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4.17 Serial DTU point-to-point solution not working

Problem: Take two H820. Both support Serial to cellular gateway feature (DTU feature). Configure one as client,

the other as server. But no work.

Answer: First, we confirm that the H820 both are online, and the server’s IP is public IP that can be ping through

from other networks.

Second, we confirm both H820’s DTU feature (Serial to Cellular Feature) are working. We test an example as

follows,

H820 DTU with vodafone SIM as client (in Germany)--- China Telecom as server (In China): working

H820 DTU with vodafone SIM as server (in Germany)--- China Telecom as client (In China): working

H820 DTU with vodafone SIM as client (in Germany)---- H820 DTU with Vodafone SIM as server (in

Germany) : no working

This indicates the two Vodafone SIM cards cannot communicates each other. The Vodafone ISP limit the two

internal’s SIM card’s communication.

You have two ways to solve the problem.

1) Get another SIM card from another ISP to test.

2) Ask the Vodafone ISP to unlimit two Vadafone SIM's communication.

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4.18 Can’t open device /dev/ttyUSBx.

Problem: Status page shows “Can’t open device /dev/ttyUSBx”.

Solution:

Step 1) H820 Router Web – Internet Settings – WAN, at Cell Modem, please choose “AUTO_DETECT” and click

“Apply” button.

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E-Lins H685m Series Manual do Utilizador Página 97