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Support for BiDiB

Drive Command, Coding of Speed Setting

Speed values are always coded with 127 step plus additional direction bit. The node which includes the command station should translate this speed code to the appropriate format. Speed = 1 is used as coding for emergency stop.

The formula is the same as in the p50x protocol known from Tams EasyControl or Uhlenbrock Intellibox.

Coding for the Motorola format uses the same conversion as DCC. Additionally, on MM systems there is a 'emulierted' format with 27 speed steps (MM27). This coding is derived from MM14 and uses an alternate transmission of lower / upper MM14 value for the intermediate steps in MM27.

Conversion of speed to DCC

BiDiB speed value	DCC128		DCC28		DCC14
0	0	0x00	0	0b00000	0	0b0000
1	ES	0x01	ES	0b00001	ES	0b0001
2	1	0x02	1	0b00010	1	0b0010
3	2	0x03	1	0b00010	1	0b0010
4	3	0x04	1	0b00010	1	0b0010
5	4	0x05	1	0b00010	1	0b0010
6	5	0x06	1	0b00010	1	0b0010
7	6	0x07	2	0b10010	1	0b0010
8	7	0x08	2	0b10010	1	0b0010
9	8	0x09	2	0b10010	1	0b0010
10	9	0x0a	2	0b10010	1	0b0010
11	10	0x0b	3	0b00011	2	0b0011
12	11	0x0c	3	0b00011	2	0b0011
13	12	0x0d	3	0b00011	2	0b0011
14	13	0x0e	3	0b00011	2	0b0011
15	14	0x0f	3	0b00011	2	0b0011
16	15	0x10	4	0b10011	2	0b0011
17	16	0x11	4	0b10011	2	0b0011
18	17	0x12	4	0b10011	2	0b0011
19	18	0x13	4	0b10011	2	0b0011
20	19	0x14	5	0b00100	3	0b0100
21	20	0x15	5	0b00100	3	0b0100
22	21	0x16	5	0b00100	3	0b0100
23	22	0x17	5	0b00100	3	0b0100
24	23	0x18	5	0b00100	3	0b0100
25	24	0x19	6	0b10100	3	0b0100
26	25	0x1a	6	0b10100	3	0b0100
27	26	0x1b	6	0b10100	3	0b0100
28	27	0x1c	6	0b10100	3	0b0100
29	28	0x1d	7	0b00101	4	0b0101
30	29	0x1e	7	0b00101	4	0b0101
31	30	0x1f	7	0b00101	4	0b0101
32	31	0x20	7	0b00101	4	0b0101
33	32	0x21	7	0b00101	4	0b0101
34	33	0x22	8	0b10101	4	0b0101
35	34	0x23	8	0b10101	4	0b0101
36	35	0x24	8	0b10101	4	0b0101
37	36	0x25	8	0b10101	4	0b0101
38	37	0x26	9	0b00110	5	0b0110
39	38	0x27	9	0b00110	5	0b0110
40	39	0x28	9	0b00110	5	0b0110
41	40	0x29	9	0b00110	5	0b0110
42	41	0x2a	9	0b00110	5	0b0110
43	42	0x2b	10	0b10110	5	0b0110
44	43	0x2c	10	0b10110	5	0b0110
45	44	0x2d	10	0b10110	5	0b0110
46	45	0x2e	10	0b10110	5	0b0110
47	46	0x2f	11	0b00111	6	0b0111
48	47	0x30	11	0b00111	6	0b0111
49	48	0x31	11	0b00111	6	0b0111
50	49	0x32	11	0b00111	6	0b0111
51	50	0x33	11	0b00111	6	0b0111
52	51	0x34	12	0b10111	6	0b0111
53	52	0x35	12	0b10111	6	0b0111
54	53	0x36	12	0b10111	6	0b0111
55	54	0x37	12	0b10111	6	0b0111
56	55	0x38	13	0b01000	7	0b1000
57	56	0x39	13	0b01000	7	0b1000
58	57	0x3a	13	0b01000	7	0b1000
59	58	0x3b	13	0b01000	7	0b1000
60	59	0x3c	13	0b01000	7	0b1000
61	60	0x3d	14	0b11000	7	0b1000
62	61	0x3e	14	0b11000	7	0b1000
63	62	0x3f	14	0b11000	7	0b1000
64	63	0x40	14	0b11000	7	0b1000
65	64	0x41	15	0b01001	8	0b1001
66	65	0x42	15	0b01001	8	0b1001
67	66	0x43	15	0b01001	8	0b1001
68	67	0x44	15	0b01001	8	0b1001
69	68	0x45	15	0b01001	8	0b1001
70	69	0x46	16	0b11001	8	0b1001
71	70	0x47	16	0b11001	8	0b1001
72	71	0x48	16	0b11001	8	0b1001
73	72	0x49	16	0b11001	8	0b1001
74	73	0x4a	17	0b01010	9	0b1010
75	74	0x4b	17	0b01010	9	0b1010
76	75	0x4c	17	0b01010	9	0b1010
77	76	0x4d	17	0b01010	9	0b1010
78	77	0x4e	17	0b01010	9	0b1010
79	78	0x4f	18	0b11010	9	0b1010
80	79	0x50	18	0b11010	9	0b1010
81	80	0x51	18	0b11010	9	0b1010
82	81	0x52	18	0b11010	9	0b1010
83	82	0x53	19	0b01011	10	0b1011
84	83	0x54	19	0b01011	10	0b1011
85	84	0x55	19	0b01011	10	0b1011
86	85	0x56	19	0b01011	10	0b1011
87	86	0x57	19	0b01011	10	0b1011
88	87	0x58	20	0b11011	10	0b1011
89	88	0x59	20	0b11011	10	0b1011
90	89	0x5a	20	0b11011	10	0b1011
91	90	0x5b	20	0b11011	10	0b1011
92	91	0x5c	21	0b01100	11	0b1100
93	92	0x5d	21	0b01100	11	0b1100
94	93	0x5e	21	0b01100	11	0b1100
95	94	0x5f	21	0b01100	11	0b1100
96	95	0x60	21	0b01100	11	0b1100
97	96	0x61	22	0b11100	11	0b1100
98	97	0x62	22	0b11100	11	0b1100
99	98	0x63	22	0b11100	11	0b1100
100	99	0x64	22	0b11100	11	0b1100
101	100	0x65	23	0b01101	12	0b1101
102	101	0x66	23	0b01101	12	0b1101
103	102	0x67	23	0b01101	12	0b1101
104	103	0x68	23	0b01101	12	0b1101
105	104	0x69	23	0b01101	12	0b1101
106	105	0x6a	24	0b11101	12	0b1101
107	106	0x6b	24	0b11101	12	0b1101
108	107	0x6c	24	0b11101	12	0b1101
109	108	0x6d	24	0b11101	12	0b1101
110	109	0x6e	25	0b01110	13	0b1110
111	110	0x6f	25	0b01110	13	0b1110
112	111	0x70	25	0b01110	13	0b1110
113	112	0x71	25	0b01110	13	0b1110
114	113	0x72	25	0b01110	13	0b1110
115	114	0x73	26	0b11110	13	0b1110
116	115	0x74	26	0b11110	13	0b1110
117	116	0x75	26	0b11110	13	0b1110
118	117	0x76	26	0b11110	13	0b1110
119	118	0x77	27	0b01111	14	0b1111
120	119	0x78	27	0b01111	14	0b1111
121	120	0x79	27	0b01111	14	0b1111
122	121	0x7a	27	0b01111	14	0b1111
123	122	0x7b	27	0b01111	14	0b1111
124	123	0x7c	28	0b11111	14	0b1111
125	124	0x7d	28	0b11111	14	0b1111
126	125	0x7e	28	0b11111	14	0b1111
127	126	0x7f	28	0b11111	14	0b1111

Conversion of speed to MM

BiDiB speed value	M4/MFX	MM28	MM27	MM14
0	0	0	0	0
1	ES	ES	ES	ES
2	1	1	1	1
3	2	1	1	1
4	3	1	1	1
5	4	1	1	1
6	5	1	1	1
7	6	2	2	1
8	7	2	2	1
9	8	2	2	1
10	9	2	2	1
11	10	3	2	2
12	11	3	3	2
13	12	3	3	2
14	13	3	3	2
15	14	3	3	2
16	15	4	4	2
17	16	4	4	2
18	17	4	4	2
19	18	4	4	2
20	19	5	4	3
21	20	5	5	3
22	21	5	5	3
23	22	5	5	3
24	23	5	5	3
25	24	6	5	3
26	25	6	6	3
27	26	6	6	3
28	27	6	6	3
29	28	7	6	4
30	29	7	7	4
31	30	7	7	4
32	31	7	7	4
33	32	7	7	4
34	33	8	7	4
35	34	8	8	4
36	35	8	8	4
37	36	8	8	4
38	37	9	8	5
39	38	9	8	5
40	39	9	9	5
41	40	9	9	5
42	41	9	9	5
43	42	10	9	5
44	43	10	10	5
45	44	10	10	5
46	45	10	10	5
47	46	11	10	6
48	47	11	10	6
49	48	11	11	6
50	49	11	11	6
51	50	11	11	6
52	51	12	11	6
53	52	12	11	6
54	53	12	12	6
55	54	12	12	6
56	55	13	12	7
57	56	13	12	7
58	57	13	12	7
59	58	13	13	7
60	59	13	13	7
61	60	14	13	7
62	61	14	13	7
63	62	14	14	7
64	63	14	14	7
65	64	15	14	8
66	65	15	14	8
67	66	15	14	8
68	67	15	15	8
69	68	15	15	8
70	69	16	15	8
71	70	16	15	8
72	71	16	16	8
73	72	16	16	8
74	73	17	16	9
75	74	17	16	9
76	75	17	16	9
77	76	17	17	9
78	77	17	17	9
79	78	18	17	9
80	79	18	27	9
81	80	18	17	9
82	81	18	18	9
83	82	19	18	10
84	83	19	18	10
85	84	19	18	10
86	85	19	19	10
87	86	19	19	10
88	87	20	19	10
89	88	20	19	10
90	89	20	19	10
91	90	20	20	10
92	91	21	20	11
93	92	21	20	11
94	93	21	20	11
95	94	21	20	11
96	95	21	21	11
97	96	22	21	11
98	97	22	21	11
99	98	22	21	11
100	99	22	22	11
101	100	23	22	12
102	101	23	22	12
103	102	23	22	12
104	103	23	22	12
105	104	23	23	12
106	105	24	23	12
107	106	24	23	12
108	107	24	23	12
109	108	24	23	12
110	109	25	24	13
111	110	25	24	13
112	111	25	24	13
113	112	25	24	13
114	113	25	25	13
115	114	26	25	13
116	115	26	25	13
117	116	26	25	13
118	117	26	25	13
119	118	27	26	14
120	119	27	26	14
121	120	27	26	14
122	121	27	26	14
123	122	27	26	14
124	123	28	27	14
125	124	28	27	14
126	125	28	27	14
127	126	28	27	14

Convert from BiDiB to Track Format

The following code snippet shows the translation from BiDiB format to DCC (rail format):

unsigned char convert_speed_to_rail(unsigned char speed128, t_format format)
  {
    unsigned char retval, myspeed, direction;
    retval = speed128;             // by default
    myspeed = speed128 & 0x7F;     // mask direction
    direction = speed128 & 0x80;

    switch(format)
      {
        case DCC14:
            if (myspeed > 1)
              {
                retval = (myspeed - 2) / 9 + 2;
                retval |= direction;
              }
            break;
        case DCC28:
            if (myspeed > 1)
              {
                retval = (myspeed - 2) * 2 / 9 + 2;
                retval |= direction;
              }
            break;
        case DCC128:
            break;
      }
    return(retval);
  }

Convert from Track Format to BiDiB

The following code snippet shows the translation from DCC to BiDiB:

// convert a speed given in true rail format (incl. E-Stop) into full 127 step format
unsigned char convert_speed_from_rail(unsigned char speed, t_format format)
  {
    unsigned char retval, myspeed, direction;
    retval = speed;             // by default
    myspeed = speed & 0x7F;     // mask direction
    direction = speed & 0x80;

    switch(format)
      {
        case DCC14:
            if (myspeed > 1)
              {
                retval = (myspeed - 2) * 9 + 2;
                retval |= direction;
              }
            break;
        case DCC28:
            if (myspeed > 1)
              {
                retval = ((myspeed - 2) * 9 + 1 )/ 2 + 2;
                retval |= direction;
              }
            break;
        case DCC128:
            break;
      }
    return(retval);
  }