How to make null modem cable dreambox

Currently spreading artificial intelligence to the wildest locations in production environments. He never stops learning. Null modem, an introduction Original use of RS Null modem without handshaking Null modem with loop back handshaking Null modem with partial handshaking Null modem with full handshaking Null modem layout selection table Null modem, an introduction Serial communications with RS One of the oldest and most widely spread communication methods in computer world.

The way this type of communication can be performed is pretty well defined in standards. For your information, DTE means data terminal equipment computers etc. In history, practical solutions were developed to let two computers talk with each other using a null modem serial communication line.

In most situations, the original modem signal lines are reused to perform some sort of handshaking. Handshaking can increase the maximum allowed communication speed because it gives the computers the ability to control the flow of information. High amounts of incomming data is allowed if the computer is capable to handle it, but not if it is busy performing other tasks. If no flow control is implemented in the null modem connection, communication is only possible at speeds at which it is sure the receiving side can handle the amount information even under worst case conditions.

When we look at the connector pinout of the RS port, we see two pins which are certainly used for flow control. A simple but useful mechanism allowing flow control in one direction. In the past, this was true. Modem speeds of baud were common and baud was seen as a high speed connection.

For further control of the information flow, both devices have the ability to signal their status to the other side. These signals are in one direction only. It is not used directly for flow control, but mainly an indication of the ability of the modem device to communicate with its counter part.

This signal indicates the existence of a communication link between two modem devices. How to use the handshaking lines in a null modem configuration? In that situation, only the data lines and signal ground are cross connected in the null modem communication cable.

All other pins have no connection. An example of such a null modem cable without handshaking can be seen in the figure below. If you read about null modems, this three wire null modem cable is often talked about.

Yes, it is simple but can we use it in all circumstances? These signals normally define the ability of the other side to communicate. As they are not connected, their signal level will never go high. This might cause a problem. If the software on both sides is well structured, the RTS output is set high and then a waiting cycle is started until a ready signal is received on the CTS line. This causes the software to hang because no physical connection is present to either CTS line to make this possible.

This does however not mean, that this null modem cable is useless. Hi, Can you please help me? I received my new DM today and I want to flash it with Gemini.

I used DreamUp V1. After connecting the box, I clicked on Flash and choosed the image file. Log pane is saying : Calculating checksum This lasted at least 30mns. I got same problem like you thoura with my DM when i tried the Dreamup using the RS cable or the lan connection.

Hi dreamsat2. I followed your step by step explanation of using universal dreamup. Originally posted by nofear-tn i advice you to make the traditional way for DM : 1- activate DHCP server in your router or any server 2-plug the power and keep pressing the power boton till the box gets and IP and writes STOP. In other word, there are only 3 pins that are required for connectivity, namely pin 2, 3 and pin 5. While sustaining pin 5 from one end to the other, just connect pin 2 of one end to pin 3 of the other end and vice versa and you are done Refer simple diagram below.

Once after download the Universal DreamUp utility, launch it with both PC and Dreambox decoder connected and you are ready to go. First, go to select the correct Com port on the utility screen corresponding to the one used on your PC.