SAMUEL
2019-9-20
CHONGHAN CH-M3 WIRELESS MODEM USER MANUAL
页
8
1.4.
Products List
Product
Description
CH-
M3G2Q2
GPRS
GSM850,EGSM900,DCS1800,PCS1900
Support:China Mobile Network
RS232/RS485/TTL/USB
CH-
M3G7Z19
LTE
GSM: B3, B8
TD-SCDMA: B34/B39
FDD-LTE :B1/B3
TDD-LTE :B38/B39/B40/B41
CDMA 1X:800M
CDMA EVDO: 800M
WCDMA: B1
Support China Mobile, China Unicom, China
Telecom network
RS232/RS485/TTL/USB
1.5.
Presentation Rules
The AT commands ignore case. For recognizable, the lowercase for input and uppercase for
respond. For example:
at<cr>
// input command
OK
// device response
The send mode support all character send and receive, other mode only below valid:
Type
Value
Describe
Printable
0x20 ~ 0xfe
<0x20> … <0xfe>
Carriage Return
0x0d
<cr>
Line Feed
0x0a
<lf>
transmit
0x1a
<ctrl+z>
Escape
0x1b
<esc>
1.6.
AT Command Syntax
at+xxx=?<cr>
// returns the list of parameters and value ra
nges
at+xxx=yyy<cr>
// sets user-definable parameter values
at+xxx?<cr>
// returns the currently set value
at+xxx<cr>
// execution command
Note: the AT command not case-sensitive, prefix by at and terminate by
<CR>.
2.
Introduction
With the development of wireless communication technologies, wireless products are being
adopted in numerous industrial and civilian fields. Shenzhen Chonghan Co., Ltd. a leader of wireless
communication equipment manufacturer releases the CH-M3 Series Wireless Modems, which
support various frequency bands of GPRSLTE, and provide industrial terminal solutions for
2.5G/2.75G communication. As a wireless modem, it support AT command set via RS-232/RS-