Digidim RS232 Руководство пользователя - Страница 4
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Печатать страницуDigidim 503AV / 505 RS232 AV Interface User Guide
2. Interface Power
2.1. 505 Interface Power
The Digidim 505 interface takes power from the serial port for operation of the RS232 link.
This differs between the old type (black case) and new type (transparent case).
Old type (black case)
Either or both the RTS and DTR lines must be set to HIGH for operation. Internally the
lines are diode 'or'd'.
Note:
Some low-power RS232 ports do not provide enough power if only one of these
lines is HIGH. Setting both to HIGH always provides enough power
New type (transparent case)
This requires the RTS line to be set to HIGH, and the DTR line to be set to LOW. Both
these lines must be connected for the interface to function. No ground connection is
required.
Note:
Internally, the DTR line is connected to DCD, but connection to DCD is not
required for operation.
Where the control interface does not allow setting of the RTS and DTR lines as required
then an external DC supply must be used. The exact specification of the DC supply is not
critical but must be of double-insulation rating with a floating output. The voltage must be
between +/- 4 and +/- 12 volts and remain stable with no load. The supply negative is
connected to pin 4 of the interface, the supply positive to pin 7 of the interface, and the
supply 0 volt reference to the Host GND connection.
Both types
The main operating power and DALI communications are taken from the DALI connection.
In the absence of a DALI supply connection the interface will not function.
Note:
Interface's nominal power consumption is 3mA from the RS232 port and 10mA
from DALI.
2.2. 503AV Interface Power
The interface is powered entirely from the Digidim connection. The RS232 connection is
RX, TX and GND. All connections are via terminals, with the Digidim connection using the
standard Helvar 6-way terminal connector.
Doc. No. 7860076
Page 2
Helvar Ltd.
.
Issue 8