AN103
in the Evaluation Scheme.
7.
Buttons –There are 5 buttons (S1-S5) on the RF-EB next to the LCD for the user to complete the evaluation modules configuration and demonstration following the step-by-step instructions shown on the LCD.
5.2 LCD Functional Icons
The Functional icons are displayed on the LCD to guide the user to go through the configuration process. The functions are shown in the table below.
Table 5. LCD Functional Icons Descriptions
Functional Icon Descriptions
Cursor pointer, the cursor pointer only points to the items which are configurable.
Move cursor pointer up and down.
Reset all configurations and return to the initial page.
Go back to the previous page.
Go forward to the next page.
Increase value or select the next option.
Decrease value or select the previous option.
Select to complete configuration and ready to start Tx/Rx.
Start transmitting. The pre-defined frame is transmitted repeatedly until the TxOff is selected. This is only available when working with CMT2110A-EM.
Stop transmitting. This is only available when working with CMT2110A-EM.
Start receiving until the RxOff is selected. This is only available when working with CMT2210A-EM.
Stop receiving. This is only available when working with CMT2210A-EM.
The user should notice the following points:
1.
The RF-EB supports frequencies of 315 MHz, 433.92 MHz, 868.35 MHz and 915 MHz, when the frequency is changed from one to the other, the matching network of the evaluation modules should be changed accordingly.
2.
To allow successfully transmission between the Tx and the Rx, the frame format of the Rx evaluation module must be set
identical to that of the Tx evaluation module, see Table 6 for the frame format definition.
Table 6. Frame Structure
Field Number of Bytes Descriptions
ID 1 This is the synchronization ID. The content is from 0 to 9.
Length
Payload
1
Indicated by Length
This indicates the length of the payload to be transmitted or received.
The content is from 1 to 32.
The data to be transmitted or received. The content is 0x(00+55)
0x(01+55) 0x(02+55) … (Length – 2 + 0x55) (Length – 1 + 0x55).
Note:
Example: if ID = 8, n = 10, the frame content is: 0x08 0x0A 0x55 0x56 … 0x5D 0x5E.
Default Value
5
10
-
3.
The Packet Error Rate (PER) can be impacted by:
The matching network of the Tx and Rx evaluation module.
The symbol rate. The Rx and the Tx symbol rate must be identical.
The number of bytes contained in the frame. The shorter the frame is, the lower PER is achieved.
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