Manufacturer Specific Profile Area
Manual • Doc.-No.: C.3055.21 / Rev. 1.1
CAN-CBX-COM2
Page 106 of 125
8.12.2.7 Protocol
An overview of the communication parameters 2800
h
and 2900
h
is shown on page 95.
Parameter name
Protocol
Object index,
Sub-index
2800
h
, 06
h
(COM A)/
2900
h
, 06
h
(COM B)
Access mode
rw
Data type
unsigned 8
Value range
00...63
h
Unit
n.a.
Default value
00
h
Description:
By means of parameter Protocol handshake functions of CAN and the serial
interface can be selected.
Bit
Name
Meaning
0
RTR
0 - no RTR-handshake (default setting)
1 - remote mode (RTR-handshake)
1
XON/XOFF
0 - no XON/XOFF
1 - XON/XOFF-handshake enabled
2...4
-
reserved (always set to ‘0’)
5
Rx_Break
0 - usage of Rx_Break disabled
1 - usage of Rx_Break enabled
6
Tx_Break
0 - usage of Tx_Break disabled
1 - usage of Tx_Break enabled
7
-
reserved
Table 31: Bits of the parameter Protocol
Bit 0: RTR_HS (RTR-Handshake)
In this handshake mode the CAN-CBM-COM2 module responds with an RTR-frame
to the Rx-data received by a CAN master (data CAN -> serial) if capacity for at least
one more CAN frame is available in the buffer. The RTR-frame is transmitted on the
identifier on which the data has been received (RxPDO1).
The module can send RTR-frames cyclically if the data of the CAN master fail to
appear. For this option the parameter RTR_T_Cycle (2800
h
, 13
d
, see page 113) has
to be set correspondingly and the buffer of the CAN-CBM-COM2 module must be
empty.