PowerH SERIES
3 LOCK-LED
The LOCK-LED lights green as soon as the AES/EBU input has been synchronized to the
incoming signal and thus proper audio transmission has been established. The LOCK-LED is dimmed with no digital audio signal being present at the input or the internal PLL not having
locked on to the incoming signal. The audio signal gets muted when the digital input has been selected.
4 REMOTE CAN BUS Connection
The RCM-26 module provides two Neutrik EtherCon® 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. For comprehensive information and instructions on cabling and bus length, please refer to the “CAN Bus principles“ paragraph, starting on page 41. Along with the CAN bus, network cabling also carries a balanced audio monitoring signal. This monitor bus allows software-controlled monitoring of input or output signals of all power amps in the remote network, without the need for additional wiring. Nominal output level is +6 dBu (1.55 V) and maximum output level is +21 dBu (8.7 V). 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). 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 4.1: Transfer rate and bus length
Illustration 4.6: Pin-assignment of CAN jack
Illustration 4.7: Pin-assignment of CAN plug
