CM17A Protocol

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FireCracker (CM17A) Communications Specification


1. Communication Format.

The transmission of data to the FireCracker is not time critical as the FireCracker interface will determine the data rate from the speed at which the signals change. A minimum signal rate of 0.5ms is recommended.

1.1 Power Supply.

The FireCracker derives its power supply from either the RTS or DTR signals from the serial port. At least one of these signals must be high at all times to ensure that power is not lost from the FireCracker.

1.2 Bit Signaling.

The following table defines the states of the RTS and DTR signals required to send a logical '1' and logical '0' to the interface:

Signal RTS DTR Reset 0 0 Logical '1' 1 0 Logical '0' 0 1 Standby 1 1

1.3 Transmission Format.

While transmitting data to the FireCracker, it is important to ensure that at least one of the signals (RTS or DTR) is high at all times to supply power to the device. Should both of the signals drop to 0 at any time, the FireCracker will be reset and will require the entire signal to be transmitted again. The recommended signal stream is as follows:

Standby | '1' | Wait | '0' | Wait | '1' | Wait... _____________________ _____________________ RTS _| |_____| ________ ___________________ ________ DTR _| |_____| |_____|

The recommended time for the '1', '0' and 'Wait' states is at least 0.5ms.

Each transmission consists of 40 bits. This is made up of the following:

Header 16 bits Data 16 bits Footer 8 bits

The header and footer never change and are defined as follows:

Header 11010101 10101010 Footer 10101101

1.4 Bright and Dim transmissions.

To brighten or dim a lamp, it is necessary to send consecutive signals (each equivalent to a 5% dim or brighten) until the desired level is attained.


2. Data Table

A1 ON 01100000 00000000 A1 OFF 01100000 00100000 A2 ON 01100000 00010000 A2 OFF 01100000 00110000 A3 ON 01100000 00001000 A3 OFF 01100000 00101000 A4 ON 01100000 00011000 A4 OFF 01100000 00111000 A5 ON 01100000 01000000 A5 OFF 01100000 01100000 A6 ON 01100000 01010000 A6 OFF 01100000 01110000 A7 ON 01100000 01001000 A7 OFF 01100000 01101000 A8 ON 01100000 01011000 A8 OFF 01100000 01111000 A9 ON 01100100 00000000 A9 OFF 01100100 00100000 A10 ON 01100100 00010000 A10 OFF 01100100 00110000 A11 ON 01100100 00001000 A11 OFF 01100100 00101000 A12 ON 01100100 00011000 A12 OFF 01100100 00111000 A13 ON 01100100 01000000 A13 OFF 01100100 01100000 A14 ON 01100100 01010000 A14 OFF 01100100 01110000 A15 ON 01100100 01001000 A15 OFF 01100100 01101000 A16 ON 01100100 01011000 A16 OFF 01100100 01111000 A BRIGHT 005 01100000 10001000 A DIM 005 01100000 10011000 B1 ON 01110000 00000000 B1 OFF 01110000 00100000 B2 ON 01110000 00010000 B2 OFF 01110000 00110000 B3 ON 01110000 00001000 B3 OFF 01110000 00101000 B4 ON 01110000 00011000 B4 OFF 01110000 00111000 B5 ON 01110000 01000000 B5 OFF 01110000 01100000 B6 ON 01110000 01010000 B6 OFF 01110000 01110000 B7 ON 01110000 01001000 B7 OFF 01110000 01101000 B8 ON 01110000 01011000 B8 OFF 01110000 01111000 B9 ON 01110100 00000000 B9 OFF 01110100 00100000 B10 ON 01110100 00010000 B10 OFF 01110100 00110000 B11 ON 01110100 00001000 B11 OFF 01110100 00101000 B12 ON 01110100 00011000 B12 OFF 01110100 00111000 B13 ON 01110100 01000000 B13 OFF 01110100 01100000 B14 ON 01110100 01010000 B14 OFF 01110100 01110000 B15 ON 01110100 01001000 B15 OFF 01110100 01101000 B16 ON 01110100 01011000 B16 OFF 01110100 01111000 B BRIGHT 005 01110000 10001000 B DIM 005 01110000 10011000 C1 ON 01000000 00000000 C1 OFF 01000000 00100000 C2 ON 01000000 00010000 C2 OFF 01000000 00110000 C3 ON 01000000 00001000 C3 OFF 01000000 00101000 C4 ON 01000000 00011000 C4 OFF 01000000 00111000 C5 ON 01000000 01000000 C5 OFF 01000000 01100000 C6 ON 01000000 01010000 C6 OFF 01000000 01110000 C7 ON 01000000 01001000 C7 OFF 01000000 01101000 C8 ON 01000000 01011000 C8 OFF 01000000 01111000 C9 ON 01000100 00000000 C9 OFF 01000100 00100000 C10 ON 01000100 00010000 C10 OFF 01000100 00110000 C11 ON 01000100 00001000 C11 OFF 01000100 00101000 C12 ON 01000100 00011000 C12 OFF 01000100 00111000 C13 ON 01000100 01000000 C13 OFF 01000100 01100000 C14 ON 01000100 01010000 C14 OFF 01000100 01110000 C15 ON 01000100 01001000 C15 OFF 01000100 01101000 C16 ON 01000100 01011000 C16 OFF 01000100 01111000 C BRIGHT 005 01000000 10001000 C DIM 005 01000000 10011000 D1 ON 01010000 00000000 D1 OFF 01010000 00100000 D2 ON 01010000 00010000 D2 OFF 01010000 00110000 D3 ON 01010000 00001000 D3 OFF 01010000 00101000 D4 ON 01010000 00011000 D4 OFF 01010000 00111000 D5 ON 01010000 01000000 D5 OFF 01010000 01100000 D6 ON 01010000 01010000 D6 OFF 01010000 01110000 D7 ON 01010000 01001000 D7 OFF 01010000 01101000 D8 ON 01010000 01011000 D8 OFF 01010000 01111000 D9 ON 01010100 00000000 D9 OFF 01010100 00100000 D10 ON 01010100 00010000 D10 OFF 01010100 00110000 D11 ON 01010100 00001000 D11 OFF 01010100 00101000 D12 ON 01010100 00011000 D12 OFF 01010100 00111000 D13 ON 01010100 01000000 D13 OFF 01010100 01100000 D14 ON 01010100 01010000 D14 OFF 01010100 01110000 D15 ON 01010100 01001000 D15 OFF 01010100 01101000 D16 ON 01010100 01011000 D16 OFF 01010100 01111000 D BRIGHT 005 01010000 10001000 D DIM 005 01010000 10011000 E1 ON 10000000 00000000 E1 OFF 10000000 00100000 E2 ON 10000000 00010000 E2 OFF 10000000 00110000 E3 ON 10000000 00001000 E3 OFF 10000000 00101000 E4 ON 10000000 00011000 E4 OFF 10000000 00111000 E5 ON 10000000 01000000 E5 OFF 10000000 01100000 E6 ON 10000000 01010000 E6 OFF 10000000 01110000 E7 ON 10000000 01001000 E7 OFF 10000000 01101000 E8 ON 10000000 01011000 E8 OFF 10000000 01111000 E9 ON 10000100 00000000 E9 OFF 10000100 00100000 E10 ON 10000100 00010000 E10 OFF 10000100 00110000 E11 ON 10000100 00001000 E11 OFF 10000100 00101000 E12 ON 10000100 00011000 E12 OFF 10000100 00111000 E13 ON 10000100 01000000 E13 OFF 10000100 01100000 E14 ON 10000100 01010000 E14 OFF 10000100 01110000 E15 ON 10000100 01001000 E15 OFF 10000100 01101000 E16 ON 10000100 01011000 E16 OFF 10000100 01111000 E BRIGHT 005 10000000 10001000 E DIM 005 10000000 10011000 F1 ON 10010000 00000000 F1 OFF 10010000 00100000 F2 ON 10010000 00010000 F2 OFF 10010000 00110000 F3 ON 10010000 00001000 F3 OFF 10010000 00101000 F4 ON 10010000 00011000 F4 OFF 10010000 00111000 F5 ON 10010000 01000000 F5 OFF 10010000 01100000 F6 ON 10010000 01010000 F6 OFF 10010000 01110000 F7 ON 10010000 01001000 F7 OFF 10010000 01101000 F8 ON 10010000 01011000 F8 OFF 10010000 01111000 F9 ON 10010100 00000000 F9 OFF 10010100 00100000 F10 ON 10010100 00010000 F10 OFF 10010100 00110000 F11 ON 10010100 00001000 F11 OFF 10010100 00101000 F12 ON 10010100 00011000 F12 OFF 10010100 00111000 F13 ON 10010100 01000000 F13 OFF 10010100 01100000 F14 ON 10010100 01010000 F14 OFF 10010100 01110000 F15 ON 10010100 01001000 F15 OFF 10010100 01101000 F16 ON 10010100 01011000 F16 OFF 10010100 01111000 F BRIGHT 005 10010000 10001000 F DIM 005 10010000 10011000 G1 ON 10100000 00000000 G1 OFF 10100000 00100000 G2 ON 10100000 00010000 G2 OFF 10100000 00110000 G3 ON 10100000 00001000 G3 OFF 10100000 00101000 G4 ON 10100000 00011000 G4 OFF 10100000 00111000 G5 ON 10100000 01000000 G5 OFF 10100000 01100000 G6 ON 10100000 01010000 G6 OFF 10100000 01110000 G7 ON 10100000 01001000 G7 OFF 10100000 01101000 G8 ON 10100000 01011000 G8 OFF 10100000 01111000 G9 ON 10100100 00000000 G9 OFF 10100100 00100000 G10 ON 10100100 00010000 G10 OFF 10100100 00110000 G11 ON 10100100 00001000 G11 OFF 10100100 00101000 G12 ON 10100100 00011000 G12 OFF 10100100 00111000 G13 ON 10100100 01000000 G13 OFF 10100100 01100000 G14 ON 10100100 01010000 G14 OFF 10100100 01110000 G15 ON 10100100 01001000 G15 OFF 10100100 01101000 G16 ON 10100100 01011000 G16 OFF 10100100 01111000 G BRIGHT 005 10100000 10001000 G DIM 005 10100000 10011000 H1 ON 10110000 00000000 H1 OFF 10110000 00100000 H2 ON 10110000 00010000 H2 OFF 10110000 00110000 H3 ON 10110000 00001000 H3 OFF 10110000 00101000 H4 ON 10110000 00011000 H4 OFF 10110000 00111000 H5 ON 10110000 01000000 H5 OFF 10110000 01100000 H6 ON 10110000 01010000 H6 OFF 10110000 01110000 H7 ON 10110000 01001000 H7 OFF 10110000 01101000 H8 ON 10110000 01011000 H8 OFF 10110000 01111000 H9 ON 10110100 00000000 H9 OFF 10110100 00100000 H10 ON 10110100 00010000 H10 OFF 10110100 00110000 H11 ON 10110100 00001000 H11 OFF 10110100 00101000 H12 ON 10110100 00011000 H12 OFF 10110100 00111000 H13 ON 10110100 01000000 H13 OFF 10110100 01100000 H14 ON 10110100 01010000 H14 OFF 10110100 01110000 H15 ON 10110100 01001000 H15 OFF 10110100 01101000 H16 ON 10110100 01011000 H16 OFF 10110100 01111000 H BRIGHT 005 10110000 10001000 H DIM 005 10110000 10011000 I1 ON 11100000 00000000 I1 OFF 11100000 00100000 I2 ON 11100000 00010000 I2 OFF 11100000 00110000 I3 ON 11100000 00001000 I3 OFF 11100000 00101000 I4 ON 11100000 00011000 I4 OFF 11100000 00111000 I5 ON 11100000 01000000 I5 OFF 11100000 01100000 I6 ON 11100000 01010000 I6 OFF 11100000 01110000 I7 ON 11100000 01001000 I7 OFF 11100000 01101000 I8 ON 11100000 01011000 I8 OFF 11100000 01111000 I9 ON 11100100 00000000 I9 OFF 11100100 00100000 I10 ON 11100100 00010000 I10 OFF 11100100 00110000 I11 ON 11100100 00001000 I11 OFF 11100100 00101000 I12 ON 11100100 00011000 I12 OFF 11100100 00111000 I13 ON 11100100 01000000 I13 OFF 11100100 01100000 I14 ON 11100100 01010000 I14 OFF 11100100 01110000 I15 ON 11100100 01001000 I15 OFF 11100100 01101000 I16 ON 11100100 01011000 I16 OFF 11100100 01111000 I BRIGHT 005 11100000 10001000 I DIM 005 11100000 10011000 J1 ON 11110000 00000000 J1 OFF 11110000 00100000 J2 ON 11110000 00010000 J2 OFF 11110000 00110000 J3 ON 11110000 00001000 J3 OFF 11110000 00101000 J4 ON 11110000 00011000 J4 OFF 11110000 00111000 J5 ON 11110000 01000000 J5 OFF 11110000 01100000 J6 ON 11110000 01010000 J6 OFF 11110000 01110000 J7 ON 11110000 01001000 J7 OFF 11110000 01101000 J8 ON 11110000 01011000 J8 OFF 11110000 01111000 J9 ON 11110100 00000000 J9 OFF 11110100 00100000 J10 ON 11110100 00010000 J10 OFF 11110100 00110000 J11 ON 11110100 00001000 J11 OFF 11110100 00101000 J12 ON 11110100 00011000 J12 OFF 11110100 00111000 J13 ON 11110100 01000000 J13 OFF 11110100 01100000 J14 ON 11110100 01010000 J14 OFF 11110100 01110000 J15 ON 11110100 01001000 J15 OFF 11110100 01101000 J16 ON 11110100 01011000 J16 OFF 11110100 01111000 J BRIGHT 005 11110000 10001000 J DIM 005 11110000 10011000 K1 ON 11000000 00000000 K1 OFF 11000000 00100000 K2 ON 11000000 00010000 K2 OFF 11000000 00110000 K3 ON 11000000 00001000 K3 OFF 11000000 00101000 K4 ON 11000000 00011000 K4 OFF 11000000 00111000 K5 ON 11000000 01000000 K5 OFF 11000000 01100000 K6 ON 11000000 01010000 K6 OFF 11000000 01110000 K7 ON 11000000 01001000 K7 OFF 11000000 01101000 K8 ON 11000000 01011000 K8 OFF 11000000 01111000 K9 ON 11000100 00000000 K9 OFF 11000100 00100000 K10 ON 11000100 00010000 K10 OFF 11000100 00110000 K11 ON 11000100 00001000 K11 OFF 11000100 00101000 K12 ON 11000100 00011000 K12 OFF 11000100 00111000 K13 ON 11000100 01000000 K13 OFF 11000100 01100000 K14 ON 11000100 01010000 K14 OFF 11000100 01110000 K15 ON 11000100 01001000 K15 OFF 11000100 01101000 K16 ON 11000100 01011000 K16 OFF 11000100 01111000 K BRIGHT 005 11000000 10001000 K DIM 005 11000000 10011000 L1 ON 11010000 00000000 L1 OFF 11010000 00100000 L2 ON 11010000 00010000 L2 OFF 11010000 00110000 L3 ON 11010000 00001000 L3 OFF 11010000 00101000 L4 ON 11010000 00011000 L4 OFF 11010000 00111000 L5 ON 11010000 01000000 L5 OFF 11010000 01100000 L6 ON 11010000 01010000 L6 OFF 11010000 01110000 L7 ON 11010000 01001000 L7 OFF 11010000 01101000 L8 ON 11010000 01011000 L8 OFF 11010000 01111000 L9 ON 11010100 00000000 L9 OFF 11010100 00100000 L10 ON 11010100 00010000 L10 OFF 11010100 00110000 L11 ON 11010100 00001000 L11 OFF 11010100 00101000 L12 ON 11010100 00011000 L12 OFF 11010100 00111000 L13 ON 11010100 01000000 L13 OFF 11010100 01100000 L14 ON 11010100 01010000 L14 OFF 11010100 01110000 L15 ON 11010100 01001000 L15 OFF 11010100 01101000 L16 ON 11010100 01011000 L16 OFF 11010100 01111000 L BRIGHT 005 11010000 10001000 L DIM 005 11010000 10011000 M1 ON 00000000 00000000 M1 OFF 00000000 00100000 M2 ON 00000000 00010000 M2 OFF 00000000 00110000 M3 ON 00000000 00001000 M3 OFF 00000000 00101000 M4 ON 00000000 00011000 M4 OFF 00000000 00111000 M5 ON 00000000 01000000 M5 OFF 00000000 01100000 M6 ON 00000000 01010000 M6 OFF 00000000 01110000 M7 ON 00000000 01001000 M7 OFF 00000000 01101000 M8 ON 00000000 01011000 M8 OFF 00000000 01111000 M9 ON 00000100 00000000 M9 OFF 00000100 00100000 M10 ON 00000100 00010000 M10 OFF 00000100 00110000 M11 ON 00000100 00001000 M11 OFF 00000100 00101000 M12 ON 00000100 00011000 M12 OFF 00000100 00111000 M13 ON 00000100 01000000 M13 OFF 00000100 01100000 M14 ON 00000100 01010000 M14 OFF 00000100 01110000 M15 ON 00000100 01001000 M15 OFF 00000100 01101000 M16 ON 00000100 01011000 M16 OFF 00000100 01111000 M BRIGHT 005 00000000 10001000 M DIM 005 00000000 10011000 N1 ON 00010000 00000000 N1 OFF 00010000 00100000 N2 ON 00010000 00010000 N2 OFF 00010000 00110000 N3 ON 00010000 00001000 N3 OFF 00010000 00101000 N4 ON 00010000 00011000 N4 OFF 00010000 00111000 N5 ON 00010000 01000000 N5 OFF 00010000 01100000 N6 ON 00010000 01010000 N6 OFF 00010000 01110000 N7 ON 00010000 01001000 N7 OFF 00010000 01101000 N8 ON 00010000 01011000 N8 OFF 00010000 01111000 N9 ON 00010100 00000000 N9 OFF 00010100 00100000 N10 ON 00010100 00010000 N10 OFF 00010100 00110000 N11 ON 00010100 00001000 N11 OFF 00010100 00101000 N12 ON 00010100 00011000 N12 OFF 00010100 00111000 N13 ON 00010100 01000000 N13 OFF 00010100 01100000 N14 ON 00010100 01010000 N14 OFF 00010100 01110000 N15 ON 00010100 01001000 N15 OFF 00010100 01101000 N16 ON 00010100 01011000 N16 OFF 00010100 01111000 N BRIGHT 005 00010000 10001000 N DIM 005 00010000 10011000 O1 ON 00100000 00000000 O1 OFF 00100000 00100000 O2 ON 00100000 00010000 O2 OFF 00100000 00110000 O3 ON 00100000 00001000 O3 OFF 00100000 00101000 O4 ON 00100000 00011000 O4 OFF 00100000 00111000 O5 ON 00100000 01000000 O5 OFF 00100000 01100000 O6 ON 00100000 01010000 O6 OFF 00100000 01110000 O7 ON 00100000 01001000 O7 OFF 00100000 01101000 O8 ON 00100000 01011000 O8 OFF 00100000 01111000 O9 ON 00100100 00000000 O9 OFF 00100100 00100000 O10 ON 00100100 00010000 O10 OFF 00100100 00110000 O11 ON 00100100 00001000 O11 OFF 00100100 00101000 O12 ON 00100100 00011000 O12 OFF 00100100 00111000 O13 ON 00100100 01000000 O13 OFF 00100100 01100000 O14 ON 00100100 01010000 O14 OFF 00100100 01110000 O15 ON 00100100 01001000 O15 OFF 00100100 01101000 O16 ON 00100100 01011000 O16 OFF 00100100 01111000 O BRIGHT 005 00100000 10001000 O DIM 005 00100000 10011000 P1 ON 00110000 00000000 P1 OFF 00110000 00100000 P2 ON 00110000 00010000 P2 OFF 00110000 00110000 P3 ON 00110000 00001000 P3 OFF 00110000 00101000 P4 ON 00110000 00011000 P4 OFF 00110000 00111000 P5 ON 00110000 01000000 P5 OFF 00110000 01100000 P6 ON 00110000 01010000 P6 OFF 00110000 01110000 P7 ON 00110000 01001000 P7 OFF 00110000 01101000 P8 ON 00110000 01011000 P8 OFF 00110000 01111000 P9 ON 00110100 00000000 P9 OFF 00110100 00100000 P10 ON 00110100 00010000 P10 OFF 00110100 00110000 P11 ON 00110100 00001000 P11 OFF 00110100 00101000 P12 ON 00110100 00011000 P12 OFF 00110100 00111000 P13 ON 00110100 01000000 P13 OFF 00110100 01100000 P14 ON 00110100 01010000 P14 OFF 00110100 01110000 P15 ON 00110100 01001000 P15 OFF 00110100 01101000 P16 ON 00110100 01011000 P16 OFF 00110100 01111000 P BRIGHT 005 00110000 10001000 P DIM 005 00110000 10011000