2N BRI Lite/Enterprise v1.1 - Manual (Page 90)

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*smsout: ch,ix,ref …SMS message was sent and was not saved into SIM card:
Ref …reference number of sent SMS 0..255 (will be used in
SMS status confirmation message)
*smspdu:
ch,ix,sts,len,pdu,csum …content of SMS message or status confirmation:
Len …SMS length (number of bytes in PDU)
Pdu …message content in PDU format
Csum …Checksum of all PDU bytes (2 hexa digits) calculated
without carry
*smsdel: ch,ix SMS message or status confirmation was deleted from position ix