Multi-Tech Systems GPRS (MTMMC-G) 사용자 설명서

Chapter 9 – Short Messages Commands  

Multi-Tech Systems, Inc. Wireless GSM/GPRS AT Commands (Document Number S000293I) 

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This command sends a message stored at location value <index>.

  

Location of stored message

Desination address 

Type of destination address 

Message reference 

syntax: AT+CMSS=<index>[,<da> [,<toda>] ] 

+CMSS: <mr> or +CMS ERROR: <err> if sending fails

If a new recipient address <da> is given, it will be used instead of the one stored with the message. 

AT+CMGW=0660123456<CR> 
Today is my birthday 
 

+CMGW: 5 
OK 
Note: Message stored with index 5  

AT+CMSS=5, 0680654321 
 
Note: Send the message 5 to a different destination number

AT+CMSS:<mr> 
OK 
Note: Successful transmission 

 
 

This command selects values for <vp>, <pid>, and <dcs>.

<fo>  

byte comprises 6 different fields:

b7 b6 

b5 

b4 

b3 

b2 

b1 

b0 

Note:   <fo> must be entered in DECIMAL format. Hexadecimal format would lead to 

irrelevant results

Reply Path, not used in text mode.

 

 

User Data Header Information, b6=1 if the beginning of the User Data field contains a 
Header in addition to the short message. This option is not supported in +CSMP 
command, but can be used in PDU mode (+CMGS). 

SRR    Status Report Request, b5=1 if a status report is requested. This mode is supported. 
VPF  

Validity Period Format 

 

  b4=0 & b3=0 -> <vp> field is not present  

 

  b4=1 & b3=0 -> <vp> field is present in relative format 

 

  Others formats (absolute & enhanced) are not supported. 

RD  

Reject Duplicates, b2=1 to instruct the SC to reject an SMS-SUBMIT for an SM still 
held in the SC that has the same <mr> and <da> as the previously submitted SM 
from the same <oa>. 

MTI  

Message Type Indicator 
b1=0 & b0=0 -> SMS-DELIVER (in the direction SC to MS) 
b1=0 & b0=1 -> SMS-SUBMIT (in the direction MS to SC) 

In text mode <vp> is only coded in “relative” format. The default value is 167 (24 hours). This 
means that one byte can describe different values: 

0 to 143 

(VP + 1) x 5 minutes (up to 12 hours) 

144 to 167 

12 hours + ( (VP – 143) x 30 minutes ) 

168 to 196 

(VP – 166) x 1 day 

197 to 255 

(VP – 192) x 1 week 

<pid>   This is used to indicate the higher layer protocol being used or indicates interworking with a 

certain type of telematic device. For example, 0x22 is for group 3 telefax, 0x24 is for voice 
telephone, 0x25 is for ERMES (European Radio Messaging System). 

<dcs>   This is used to determine the way the information is encoded. Compressed text is not 

supported. Only GSM default alphabet, 8 bit data and UCS2 alphabet are supported.