Dynacord DSA 8212, DSA 8209 Data rate of the can bus is preset to 10 kbit/s, Can addresses

DIGITAL SYSTEM AMPLIFIER

HIGH	LOW		Address
0		0	Stand-alone
0	1...	F	1...	15
1	0...	F	16...	31
2	0...	F	32...	47
3	0...	F	48...	63
4	0...	F	64...	79
5	0...	F	80...	95
6	0...	F	96...	111
7	0...	F	112...	127

HIGH	LOW		Address
8	0...	F	128...	143
9	0...	F	144...	159
A	0...	F	160...	175
B	0...	F	176...	191
C	0...	F	192...	207
D	0...	F	208...	223
E	0...	F	224...	239
F	0...	A	240...	250
F	B...	F	reserved

Table 4.1: CAN addresses

Address 0 (00 hex, delivery status) disables remote communication between the RCM-810 and the bus. The module does not appear in the system, even though it is physically connected to the CAN-bus.

2 STATUS LED

The STATUS-LED is for monitoring the communication on the CAN bus. The LED blinks rhythmically every 3 seconds, when the module’s address is set to “00“, which means that it is disconnected from the CAN bus and software control. The LED blinks rhythmically in intervals of one second, when an address in the range of 01 to 250 has been assigned to the module and there has not yet been any activity on the CAN bus. As soon as communication on the CAN bus is recognized, the LED lights for at least 100 ms, when the power amplifier sends data on the CAN bus.

3 REMOTE CAN BUS Connection

The RCM-810 module provides two RJ-45 sockets for connecting to the REMOTE CAN BUS. These sockets are connected in parallel and serve as inputs as well as for daisy-chaining the devices on the remote network. Cabling in a rack system can be established using commercially available RJ-45 network cables. However, CAN guidelines have to be observed for longer cable lengths. Both ends of the CAN-bus must be terminated using 120 Ω terminating plugs.

The CAN bus allows using different data rates, whereas the data rate is inversely proportional to the bus length. For smaller network setups, data rates can be as high as 500 kbit/s. For broader networks, reducing the data rate becomes necessary (down to the minimum data rate of 10 kbit/s).

NOTE:

The data rate of the CAN bus is preset to 10 kbit/s.

The following table illustrates the relation between data rate and bus length or network size. The use of CAN repeaters is strongly recommended for busses that exceed 1000 meters in length.

Transfer rate (in kbit/s)	Bus length (in m)
500	100
250	250
125	500
62,5	1000
20	2500
10	5000

Table 4.2: Transfer rate and bus length

Owner‘s Manual 15