DZM5168M

Revision 1.02

Page

of 17

Aug. 2014

4

RXD

TXD

I/O

VDD

GND

TXD

RXD

RESETN

VDD

GND

R

C

MCU

DZM5168D

Figure 2: DZM5168M Connection Diagram

●

TRANSPARENT MODE

In this mode DZM5168M receives data from the host through RXD pin and transfers the data

through TXD pin to the host with no protocol utilized in the data package. The data received by

RXD pin will be stored in the buffer of the module and will be transmit when one of the two

conditions is met:

1. The time interval between two continuous bytes exceeds the max. value 30ms.

2. The size of data package exceeds

In transparent mode the targeted receive module is chosen by the 16-bit object address specified

by AT command ATDS. By default DZM5168M works in API mode which can be switched to

transparent mode by AT command.

Firstly the host needs to send ‘+++’ to the module. If DZM5168M respond with OK, the module

enters into configuration mode now. By executing AT command: ATAP 0<CR><LF>, the module

will be switched to transparent mode. The host then sends AT command: ATCN to quit

configuration mode. After be resetting, DZM5168M will work in transparent mode.

The modules in transparent mode are easy to use because of no protocol concerned but there are

some disadvantages for this mode.

1. The data only can be broadcasted or only can be sent to the specified module. It will be

difficult to realize when sending data to different modules.

2. When receiving data from multiple modules, it is hard for DZM5168M to recognize the

source module so it can not judge which module is the first one to send the data.

In order to overcome such shortcomings, API MODE is introduced, which is discussed in the next

section.