Replay User Manual v.
1.2
Page 9
3.7 Audio input
Balanced STEREO L+R (at 0dBu) audio input for outside music source (SAT, DAB, CD,
etc.) with Mixer function to mix a music source with scheduled commercials; extractable
terminal strip.
3.8 Audio output
Balanced STEREO L+R (at 0dBu) audio output on extractable terminal strip.
3.9 RS232 communication
Replay can be connected by RS232 serial port to a master control system or else to a
computer. Due to noise coming from outside on the serial line, there can be anomalous
behaviour by the master system with possible damage to Replay. To prevent this kind of
danger, the following precautions must be complied with:
1. Do not let the serial cables through the same conduits as power cables or high voltage
cables. Keep a safety distance from such cables of at least 10 cm.
2. Connect the shield of the serial cable to the ground on one of its sides (do not connect
the screen from both sides). The shield also must not be grounded at the same point
where circuits with high voltages are grounded.
3. Disconnect the whole system from the power supply before starting to cable the serial
lines. Leaking or parasite current can damage the units.
4. The maximum total distance of the RS232 connection is 5 metres.
Replay, on the bus RS232, acts exclusively as slave, answering to the commands sent by
the master unit.
The RS232 connection parameters (speed, parity, check-sum, etc.) can be configured via
the configuration file
config.txt
(par. 10.2).
IMPORTANT!
The inside electronics of Replay is not galvanically insulated from the RS232 line; in case
of short circuit or ground discharge, the master system connected to the Replay may be
damaged together with the Replay itself!
