Lexicon DC-2 - Manual (Page 44)

Lexicon, Inc.
DC-2/MC-1 Serial Communications Protocol
Printed on: 10/19/00
44 of 44
SOP DLL DC CMD App DC DATA0 EOP
Cmd
F1 04 E0 01 2E F2
Because the DC-2/MC-1 received and processed the command successfully the DC-2/MC-1 responds with the DC_ACK packet. Here we see that the ACK
packet is responding to the DC_CMD_SET_INPUT_NAME command.
15.5.4 Send IR Command Example
This example shows how to transmit the IR command for “Volume Up”. The bytes are transmitted from left to right and they are defined as:
Byte 0: Start of Packet(F1 hex)
Byte 1: Data Link Layer(DLL) Data Count(DC); for an IR command this would be 4 bytes to follow
Byte 2: The Application Layer Command, in this case it is 14 hex indicating this is an IR command packet.
Byte 3: The Application Layer Data Count(DC); for this packet it is 1 data byte to follow.
Byte 4: The Application Command Data: This IR Command Packet is transmitting Key Code “Volume Up”(17 hex). To transmit other IR Key Codes
the user would replace this byte with other IR key codes as found in Appendix C DC-2/MC-1 IR-Codes.
Byte 5: End of Packet (F2 hex)
SOP DLL DC CMD AppDC DATA0 EOP
IR Key
Code
F1 04 14 01 17 F2