HF2111 GPRS Serial Server User Manual
Shanghai High-Flying Electronics Technology Co., Ltd
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. “+++” and “a” should be input in a certain period of time to make the product switch to
configuration mode. Like the following sequence.
4.2. AT+Instruction Set Overview
User can input AT+Instruction through hyper terminal or other serial debug terminal, also can
program the AT+Instruction to script. User can also input “AT+H” to list all AT+Instruction and
description to start.
Figure 8.
”AT+H” Instruction for Help
4.2.1.
Instruction Syntax Format
4.
AT+Instruction protocol is based on the instruction of ASCII command style, the
description of syntax format as follow.
Format Description
< >
: Means the parts must be included
[ ]
: Means the optional part
Command Message
AT+<CMD>[op][para-1,para-2,para-3,para-
4…]<CR>
AT+: Prefix of command message;
CMD: Command string;
[op]: Symbol of command operator,
