Shandong USR IOT Technology Limited USRGM3 用户手册
USR-GM3/GM3s User Manual
Jinan USR IOT Technology Limited
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tec@usr.cn
Basic AT commands are used to setting the running parameters of GM3 under SMS
message transmission, network transmission and HTTPD modes.
message transmission, network transmission and HTTPD modes.
Extended AT commands are used to design new functions by customers. About how to use
extended AT command, please refer to “GM3 extended AT commands User Guide”.
extended AT command, please refer to “GM3 extended AT commands User Guide”.
5.1.
5.1.
5.1.
5.1. Operating
Operating
Operating
Operating AT
AT
AT
AT command
command
command
command
When GM3 works in one of the three modes: SMS message transmission, network
transmission or HTTPD mode. You can get module into “command mode” by sending
specific timing data to it, then send commands to change module’s running parameters. If
changing is done, get module back to previous work mode.
transmission or HTTPD mode. You can get module into “command mode” by sending
specific timing data to it, then send commands to change module’s running parameters. If
changing is done, get module back to previous work mode.
In the above figure, abscissa axis means time, the data above time axis is sent to module
from device, and the data bellow time axis is sent to device from module.
from device, and the data bellow time axis is sent to device from module.
time requirement:
T1 > 200ms
T2 < 50ms
T3 < 50ms
T5 < 3s
T1 > 200ms
T2 < 50ms
T3 < 50ms
T5 < 3s
Go
Go
Go
Go into
into
into
into command
command
command
command mode:
mode:
mode:
mode:
1.Module is in SMS message transmission, network transmission or HTTPD mode.
2.Device send “+++” to module, then module send ‘a’ to device.
T7
T5
T1
T2
T4
T3
T6
Sending data to device
TIME
TIME
TIME
TIME
+
Sending data to module
+
+
a
a
+ok
AT+ENTM
OK