User's Manual
USER MANUAL
© 2013 EnOcean | www.enocean.com TCM 300x / TCM 320x User Manual | Page 45/54
TCM 300 / TCM 300C / TCM 300U
TCM 320 / TCM 320C / TCM 320U
A Serial Interface
TCM 300 provides operating modes for unidirectional (mode 0) and bidirectional (mode 1)
communication. In mode 0 all received radio messages are provided at the serial interface
as described in annex A.1. In mode 1 it is also possible to feed telegrams via the serial in-
terface into the module which will subsequently be transmitted. In addition control com-
mands can be sent and control messages can be received. This is described in annex A.2
and A.3.
A.1 EnOcean serial protocol
When the module is in “Serial Interface” mode, it transfers out data blocks of information
from the received RF telegrams. As long as no transmitter has been learned, all received
EnOcean radio telegrams are transferred. As soon as at least one transmitter has been
learned only telegrams of transmitters learned by the receiver are transmitted via the serial
interface. Telegrams can be shown on the PC using EnOcean WinEtel or DolphinView soft-
ware.
A.1.1 Message format (ESP2)
The following figure shows the message format. A block is composed of 2 synchronization
bytes, 1 byte for the header and N bytes for the message data.
Message format for asynchronous serial communication
A.1.2 Byte signals and bit order
9600 bps; 8 data bits, no parity bit, one start bit, one stop bit
Line idle is binary 1 (standard)
Each character has one start bit (binary 0), 8 information bits (least significant bit first)
and one stop bit (binary 1)
Signals and bit order sending a byte
TxD
Sync
Header
Byte0
ByteN-1
...
Sync
D0
STA
D1
D2
D3
D4
D5
D6
D7
STOP
TxD
HIGH
LOW
Bit
Time
Bit
Time
Bit
Time
Byte
Time