Ronan X120 - Manual (Page 6)

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2.0 DATA FORMAT AND PROTOCOL
All the data from the X120 is transmitted serially via RS232 (P1) to a terminal/printer and RS422/485 (P2) to
X110.
2.1 Data Transmission Format
Baudrate = 1200 / 9600
Number of data bits = 7
Number of stop bits = 1
Parity = Even
2.2 Status Format
Six bytes of data would be transmitted each time the status of any input channel changes. The formats of
these data bytes are shown below:
2.3 Protocol
The protocol between X120 and X110 is RONAN proprietary and is done to make sure that any status
data transmitted from the X120 would be received by the X110 properly. Each time the X120 transmits a
status change of an input, it will wait for approximately 250ms to receive an ACK (Ctr F) from the X110
which means that the X110 received the data without any error. If after 250ms the ACK is not received,
the same status would be transmitted again up to three times. After the third time, the transmit error LED
would be illuminated and the horn relay would be activated before sending the next status change.
Note: When an ACK is received by the X120, the transmit error LED would be turned off (if it was
on) and the horn relay would be deactivated.
3.0 SPECIAL FUNCTIONS
Along with its event collecting/transmitting tasks, the controller board performs a number of secondary tasks that
are explained in different sections.
3.1 Filtering