ID-AL EventPlayer mkII EP220 User Manual page 30

ID-AL - EventPlayer mkII - Audio and DMX player - User manual
9 - RS-232 serial link protocol
The EventPlayer mkII can communicate with other devices by receiving instructions onto the Rx input
or transferring data through its Tx output. The player complies with the RS-232 norm (see appendix for
features).
Value by default: 19200 Bauds - 8 bits - no parity - 1 bit start - 1 bit stop
(modifiable through «config.txt» file)
9.1 - Reception Protocol
With the input protocol, the player can receive instructions to launch a folder playback or sets the volume.
On the other hand , in a framework of the using of several players on the same link, the player answers
its own number (defined in the file «config.txt», see chapter 5) or to a general command.
The reception protocol is made of a 3 bytes frame.
Byte 1 (statut) + Byte 2 (command) + Byte 3 (data)
Reminder:
- a byte is composed of 8 bits: b7 b6 b5 b4 b3 b2 b1 b0
- a binary byte representation is noted: 10000000b or in hexadecimal : 80h
Byte 1 : Status - 1xxxxxxxb
The byte status is a synchonization information of frame. Its bit 8 ( b7) is always at 1. All others bits
(commands or datas) have their bit 8 to 0.
b7 = 1: refer to a status bit
b6 - b0: identification of the player to be addressed from 001 to 127 (0000001b - 1111111b)
- The address of the player is by default (ID) 001. You can modify it in the config.txt file (see chapter 5)
- Several players may have the same identification number to create groups.
- Identification 000 is the «overall» address, all players are concerned by the command (unique command
for all the players).
Example:
80h = «overall» address for all the players
81h = player n°001
9Eh = player n° 030
FFh = player n°127
Byte 2 (Command) 0xxxxxxxb + Byte 3 (Data) 0xxxxxxxb
The Byte 2 is a command and the byte3 is a data that completes the command byte. A command byte
is always followed by a byte of data. A full frame is therefore made of 3 bytes.
b7 = 0 : refer to a byte of command or data
b6, b5, b4 : bank selection for the directory jump command
b3, b2, b1, b0 : command code sent to the player
® Waves System V 1.0 - 2018
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