Computer Interface to Message Distribution (CIMD) is a proprietary short message service centre protocol developed by Nokia for their SMSC (now: Nokia Networks).
The content of the packet consists of fields separated by TAB (hex 09).
Two-digit parameter types are operation codes and each message must have exactly one.
Response code 53 with a field 060 time stamp indicates that the message was accepted; if the message failed, the SMSC would reply with field 900 (error code) instead.
You can fire SMS from message center with the help of CIMD client tools.