XpressNet & Simplemaus v.4

9 Bit, Bit 8 = Call-Byte, 62500 Baud

Received Data

Offset	Length	Content
-1	1	Preamble: 1P1100000 = Broadcast 1P10AAAAA = Inquiry, answer within 80 µs 1P11AAAAA = Message 1P00AAAAA = Acknowledge 1P01xxxxx = ???
0	1	Header
1	0..15	Data
2..16	1	XOR Checksum

ServiceMode Exit

Offset	Length	Content
0	1	0x61
1	1	0x01
2	1	XOR Checksum

ServiceMode Entry

Offset	Length	Content
0	1	0x61
1	1	0x02
2	1	XOR Checksum

0x62

Offset	Length	Content
0	1	0x62
1	1	0x22
2	1	Command Station Status Response Bit 0 = Emergency Stop Bit 1 = Emergency Off Bit 2 = AutoStart Bit 3 = Programming Mode Bit 6 = Command Station Cold Boot Bit 7 = Command Station RAM check failure
3	1	XOR Checksum

Version & Status

Offset	Length	Content
0	1	0x63
1	1	0x21
2	1	Software Version
3	1	XpressNet Status
4	1	XOR Checksum

0x81

Offset	Length	Content
0	1	0x81
1	1	??
2	1	XOR Checksum

0xE1

Offset	Length	Content
0	1	0xE1
1	1	??
2	1	XOR Checksum

Loco Information

Offset	Length	Content
0	1	0xE2
1	1	0x88 = Stack Full
2	1	??
3	1	XOR Checksum

Loco operated by another device

Offset	Length	Content
0	1	0xE3
1	1	0x40
2	1	0bxxx00000
3	1	Loco address
4	1	XOR Checksum

Loco normal info

Offset	Length	Content
0	1	0xE4
1	1	Bit 2:0 = stepcode: 0b000 = 14 steps 0b001 = 27 steps 0b010 = 28 steps 0b100 = 128 steps Bit 3 = Loco is busy by another controller Bit 7:4 = zero
2	1	Speed depending on steps 14 steps Bit 3:0 = speed 0b0001 = loco specific emergency stop with no decceleration ramp 27 steps, 28 steps Bit 3,2,1,0,4 = speed 0b00001 = not used 0b00010 = loco specific emergency stop with no decceleration ramp 0b00011 = not used 0b11111 = not used for 27 steps 128 steps (in reality 126 steps) Bit 6:0 = speed 0b0000001 = loco specific emergency stop with no decceleration ramp
3	1	Functions F4..F0 Bit 4 = F0 Bit 3 = F4 Bit 2 = F3 Bit 1 = F2 Bit 0 = F1
4	1	Functions F12..F5 Bit 7 = F12 Bit 6 = F11 Bit 5 = F10 Bit 4 = F9 Bit 3 = F8 Bit 2 = F7 Bit 1 = F6 Bit 0 = F5
5	1	XOR Checksum

Loco multi-unit info

Mehrfachtraktion

Offset	Length	Content
0	1	0xE5
1	1	Same as above
2	1	Same as above
3	1	Same as above
4	1	Same as above
5	1	MTR = Multi traction base address
6	1	XOR Checksum

Sent Data

It's only allowed to send the following packets after an Inquiry. The master regularly sends Inquiry to all Slaves (1..31).

Offset	Length	Content
0	1	Header
1	0..15	Data
2..16	1	XOR Checksum

Get Software Version Request

Offset	Length	Content
0	1	0x21
1	1	0x21
2	1	XOR Checksum (= 0x00)

Get Status

Offset	Length	Content
0	1	0x21
1	1	0x24
2	1	XOR Checksum (= 0x05)

Emergency Stop

Offset	Length	Content
0	1	0x80
1	1	XOR Checksum (= 0x80)

Emergency Off

Offset	Length	Content
0	1	0x21
1	1	0x80
2	1	XOR Checksum (= 0xA1)

Resume

Offset	Length	Content
0	1	0x21
1	1	0x81
2	1	XOR Checksum (= 0xA0)

Get Loco Info

Offset	Length	Content
0	1	0xE3
1	1	0x00
2	2	Locomotive Address (0..99) MSB first
4	1	XOR Checksum

Function Operations Request

Offset	Length	Content
0	1	0xE4
1	1	0x10 = Set 14-step speed 0x12 = Set 28-step speed 0x13 = Set 128-step speed 0x20 = Function Set
2	2	Locomotive Address (0..99) MSB first
4	1	Speed: Bit 7 = reverse direction, Bit 6:0 = speed bits as above Function F4..F0 Bit 4 = F0 Bit 3 = F4 Bit 2 = F3 Bit 1 = F2 Bit 0 = F1
5	1	XOR Checksum