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No.281 What are different between EZL-50M and EZL-50R? 28-04-2010
Category : product

EZL-50M had introduced for replacing EZL-50R which was discontinued.
Although EZL-50M designed being aimed at Pin to Pin compatibility, there are some differences.
Those are caused by hardware factors and software operations.
Then, let's look into the differences.


1. Used Hardware


EZL-50R (including EZL-50 and 50A) used 8051 series as its CPU. On the other hand, EZL-50M uses AVR series.
Because the pin assignment and interfaces are the same, we can say those products are compatible each other.


2. Size of Serial Buffer


In case of serial buffer for receiving, EZL-50R has 8 KB and EZL-50M has 17KB.
In case of the buffer for sending, EZL-50R has 4 KB and EZL-50M has 1 KB.
Anyway, you can prevent data loss by buffer overflow, if you use the hardware flow control (RTS/CTS).


3. Timing for Sending TCP data


EZL-50R checks the serial buffer every 20 ms. if there are data in the buffer, 50R sends the data to the network. On the other hand, EZL-50M waiting 10~20 ms after the last data had received. During that time, if any data has come, it sends data in the buffer to the network.
TCP is a protocol which sends and receives data in byte stream type. So, you can handle the data from both products regardless of the type of transmitting TCP data in user's application side.


4. Maximum Baud Rate


EZL-50R supports 230,400 bps and EZL-50M supports 115,200 bps.


5. RTS operation


If you don't use Flow control option(RTS/CTS), EZL-50R keeps RTS pin Active. However, the RTS pin of EZL-50M operates regardless of activating or inactivating flow control option.


6. Network RXD LED


RXD LED of EZL-50R blinks with sending data as well as receiving data. 1.1i or the older versions of EZL-50M's firmware operated same way, but it was corrected after 1.1J version.

In the below table shows the summary.



items EZL-50M EZL-50R
CPU AVR series 8051 series
Size of Serial RX buffer 17 KB 8 KB
Size of Serial TX buffer 1 KB 4 KB
TCP TX timing When any data has not come during 10~20ms after the last data had come Every 20ms checking buffer
Maximum Baud Rate 115,200 230,400
RTS operation Always Using Flow control
Network RXD LED Only receiving Both sending and receiving




See also


Related Products


[ Ethernet-Module ] EZL-50L, EZL-50M, EZL-50R