User's Manual

MaxStream 9XStream™ Wireless OEM Module Manual v2.8

Confidential and Proprietary, ©MaxStream, Inc. 2001

AT Commands

(cont.)

A modified AT value is reset upon module power-down unless the WR

command is issued to save the parameter to non-volatile memory.

To query the current value of a particular command, send the corresponding AT

command without any parameters (carriage return, however, is still sent). The

response will be the current value of that command reported as a hexadecimal

number.

The following example demonstrates basic AT Command functionality in the

9XStream module.

Example: This example will change the user-defined Module

Address to 1A0D (HEX) and check the current value of

the SM command. It will also write the new Module

Address to non-volatile memory.

SEND

RESPONSE

+++ OK<CR>

ATDT 1A0D<CR> OK<CR>

ATSM<CR> 0 <CR>

ATWR<CR>

(write to non-volatile memory)

OK<CR>

ATCN<CR>

(exit AT Command Mode)

OK<CR>

Exiting AT Command Mode

There are two ways to exit the AT command mode and return to Idle Mode. If no

valid AT commands are received within the time specified by the AT Command

Timeout parameter (CT command), the module will return to Idle Mode

automatically. Alternatively, the AT command mode can be exited by sending

the CN command.

Binary Commands

Binary command bytes are organized as follows:

1 byte

2 bytes

When sending a Binary command to the 9XStream, the Command byte must be

sent while the RTS/CMD pin (Pin 5) is asserted. RTS/CMD can be de-asserted

100 microseconds after the stop bit from the Command byte has been sent. It

does not matter whether RTS/CMD is asserted when the Parameter bytes are

sent. The command will execute when all the parameters associated with the

command have been sent. If all parameters aren’t received within 0.5 seconds

the module will return to Idle Mode.