2.3 Serial Connection
The model of the
Note: In USB v1.1 standard, if you have used the COM3, COM4…..COMn of host PC.
When you plug
Figure 2-1 RS-232 Terminal (DTE) connections
2.4 Jumper Settings
Grounding is one of the most important issues for our system. Just like Frame Ground of the computer, this signal offers a reference point of the electronic circuit inside the computer. If we want to communicate with this computer, both Signal Ground and Frame Ground should be connected to make a reference point of each other’s electronic circuit. Generally speaking, it is necessary to install an individual grounding bar for each system, such as computer networks, power systems, telecommunication networks, etc. Those individual grounding bars not only provide the individual reference point, but also make the earth a our ground!
Jumper JP1 allows choosing the ground setting. If jumpers JP1 is set as following, the pins 1 & 2 are closed and it means the ground is connected to the shell of DB9 connector. On the other words, the pins 2 & 3 are closed and it means the ground is floating
ground is connected to | ground is floating |
the shell of DB9 connector |
|
(default setting) |
|
5