DZM5168M

Revision 1.02

Page

of 17

Aug. 2014

5

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API MODE

This mode is a complimentary of transparent mode. The data will be encapsulated with frame

protocol. In this mode the AT command also can be executed with specified frame protocol. Any

data which is not compliant with frame protocol will be omitted. There are two types of data

obtained through RXD pin:

1.

Data Frame

2.

Command Frame

The data transferred to the host by TXD pin include three types:

1.

Data Frame

2.

Command Response Frame

3.

Other Information Frame

The host also can enable DZM5168M module enter into configuration mode by sending AT

command ‘+++’. If the module responds with OK, it works in configuration mode now. If the

module is in transparent mode, users can let the module enter into configuration mode and execute

AT command: ATAP 1 <CR><LF> to switch the module to API mode.

1). API Frame Structure

Each frame is consisted of four sections: Start Delimiter, Length, Frame Data and

Checksum.

Table 5: Frame Structure in API Mode

Length:

It is the effective length of frame data

Frame Data.:

Effective frame data

Checksum:

It is calculated by adding each byte of Frame data and them using 0xFFFF

to subtract one byte of the sum. The Start Delimiter and Length data are

not calculated.

2). Frame Data Structure