FBUS Frame

All FBUS frames have form descriped below.

Field Name	Length	Description
TYPE	1	Type of FBUS Frame
LEN	1	Length of Command Frame
CMD	2+	Command Frame
CRC	1	Checksum

Type

Value	Type of FBUS frame
0x01	Command frame from computer to Nokia
0x02	??? - Data call frame from computer to Nokia - ???
0x03	Data call frame from Nokia to computer
0x04	Command frame from Nokia to computer

Command length

Indicates number of octets in Command frame.

Command

Field Name	Octets	Note
CID	1	Command Identifier
SEQ	1	Sequence number
DATA	0+	Command data

List of FBUS commands

CID	DIR	Data	Resp	Description
0x0a	1	5+PNUM	0x11	Dial a Call
0x0b	4	3+PNUM		Incoming Call
0x0c	1	0		Answer to incoming call
0x0d	4	0		Incoming Call Answered (by hand)
0x0e	4	3		Connection Established
0x0f	1	0		Hang up
0x10	4	0		Hanged up - by self
0x11	4	2		Hanged up - by network
0x12	4	0		Hanged up - by self
0x13	4	0		Power ON
0x14	1	??		???
0x15	1	20	0x16	Initialization
0x16	4	1		Initialization: OK
0x17	4	1		Initialization: Fail
0x18	1		0x1e
0x19	1		0x1f
1a,1b,1c,1d
0x1e	4	1		Response to 0x18
0x1f	4	1		Responce to 0x19
0x20	1	1+	0x21,0x22	Send DTFM
0x21	4	0		Send DTFM: OK
0x22	4	1		Send DTFM: Error
0x23	1	Lot		Send SM - Header
0x24	1	Lot		Store SM - Header
0x25	1	2	0x2c+0x27,0x2d	Read SM
0x26	1	2	0x2e,0x2f	Delete SM
0x27	1&4	1+data		Send/Store/Read SM - UD
0x28	4	1		Send SM: Sent
0x29	4	2		Send SM: Error
0x2a	4	1		Store SM: OK
0x2b	4	1		Store SM: Error
0x2c	4	Lot		Read SM - Header
0x2d	4	1		Read SM: Error
0x2e	4	0		Delete SM: Deleted
0x2f	4	1		Delete SM: Error
0x30	4	Lot		SM Received
0x31
0x32	4	Lot		SM Delivered
0x33	1	?	0x34,0x35
0x34	4	1		Response to 0x33: OK?
0x35	4	?		Response to 0x33: Fail?
0x36
0x37
0x38	1	?	0x39,0x3a
0x39	4	0		Response to 0x38: OK?
0x3a	4	1		Response to 0x38: Fail?
0x3b
0x3c	1	Lot	0x3d,0x3e?	Change SMS Settings
0x3d	4	0		Response to 0x3c: OK
0x3e	4	1		Response to 0x3c: Fail ???
0x3f	1	0	0x41	Read SMS Settings and info
0x40	4	0		SMS Settings not found
0x41	4	Lot		SMS Settings and info
0x42	1	Lot	0x44,0x45	Write Phonebook Entry
0x43	1	2	0x46,0x47	Read Phonebook Entry
0x44	4	0		Response to 0x42: OK
0x45	4	1		Response to 0x42: Fail
0x46	4	Lot		Response to 0x43: Phonebook Entry
0x47	4	1		Response to 0x43: Fail
0x48	4	0		PIN Code Successfully Entered
0x49	4	0		Power OFF
0x4a	1	0	0x4b	Request Status info
0x4b	4	3		Status info
0x4c	1	0	0x4d	Request phone info
0x4d	4	Lot		Phone info

Checksum

Checksum of FBUS Frame is calculated with algorithm:

CRC = 0;

for (i = 0; i < (2 + CMD_LEN); i++)

    CRC ^= frame[i];

All octets in FBUS frame except CRC itself is counted.

Sequence Number of Command Frame

Sequence number of command in case where direction is from ME to computer, the    sequence number is counting from 0x30 to 0x37 and resetting back to 0x30. When direction is from computer to ME, sequence number counts from 0x08 to 0x0f and resets back to 0x08.
It may not be required to be this way. Sequence numbers are used in acknowledging commands.

Address

Label

Memory area

Memory location