eLink Protocol

Heartbeat request

Example message

21 24 05

Structure

Byte	Notes
0	Command station request?
1	Ping?
2	Checksum

Heartbeat response from command station

Example message

62 22 40 00

Structure

Byte	Notes
0	Command station response?
1	Pong?
2	Bit field?
3	Checksum

Loco Speed Control

Example messages

E4 13 D0 D1 80 76
E4 13 CA AC B4 25
E4 13 CA AC 00 91
E4 13 CA AC 37 A6

Stucture

Byte	Notes
0	Loco control request
1	Speed control
2	Loco Id upper byte
3	Loco Id lower byte
4	Speed reverse = 0-127 Speed forward = 128-255
5	Checksum

Loco Function Control

Example messages

E4 20 C0 9F 01 9A - Loco 159, F1 on, F0, F2-F4 off
E4 20 C0 9F 11 8A - Loco 159, F0+F1 on,  F2-F4 off
E4 28 C0 9F 10 83 - Loco 159, F25 on, F21-F24 off, F26-F28 off
E4 28 C0 9F 00 93 - Loco 159, F21-F28 off

Structure

Byte	Notes
0	Loco control request
1	Function bank (0x20, 0x21, 0x22, 0x23, 0x28)
2	Loco Id upper byte
3	Loco Id lower byte
4	Active functions bits
5	Checksum

Function Selection

Function	Bank	Bit Flag
F0	0x20	0x10
F1	0x20	0x01
F2	0x20	0x02
F3	0x20	0x04
F4	0x20	0x08
F5	0x21	0x01
F6	0x21	0x02
F7	0x21	0x04
F8	0x21	0x08
F9	0x22	0x01
F10	0x22	0x02
F11	0x22	0x04
F12	0x22	0x08
F13	0x23	0x01
F14	0x23	0x02
F15	0x23	0x04
F16	0x23	0x08
F17	0x23	0x10
F18	0x23	0x20
F19	0x23	0x40
F20	0x23	0x80
F21	0x28	0x01
F22	0x28	0x02
F23	0x28	0x04
F24	0x28	0x08
F25	0x28	0x10
F26	0x28	0x20
F27	0x28	0x40
F28	0x28	0x80

Notes

The software seems to need to track the active state of latched functions as activating and deactivating functions require selecting the relevant function bank and setting the bits for the functions that are currently active in that bank. Triggered functions are set and then cleared within a second.

Mystery Message 1

Possibly request to reset points?

Example message

52 00 8B D9

Stucture

Byte	Notes
0	???
1	Broadcast?
2	???
3	Checksum

Notes

Sent immediately after initialising loco speeds after handshake.