Digidim 503AV / 505 RS232 AV Interface User Guide
Helvar Ltd.
Doc. No. 7860076
Page 1
Issue 8
1. Overview
The DIGIDIM RS232 interface provides the means of interconnection between a Digidim
Lighting Control System and an RS232 port. Communication is bi-directional. The interface
itself is functionally passive and serves only to link the communications between the
computer (or equivalent) and DIGIDIM. The 505 interface uses the industry standard 9-pin
D-connector, allowing direct connection to such as a PC compatible serial port. The 503AV
interface is a DIN-rail mounted module, more suited to fixed installation applications.
The interface module’s power requirements are derived from the connecting systems.
Opto-coupling is used for the internal link of the two systems to provide double-insulation
between them.
Note:
You must install Digidim ‘Toolbox‘ Software to utilise the functions of the AV
interface with a Digidim Lighting Control System.
1.1. DIGIDIM and DALI
DIGIDIM is Helvar’s implementation of the application of DALI to controls and load
interfaces. It is possible that a DIGIDIM system may contain a mixture of devices, including
third party DALI-compliant ballasts or dimmers. For this reason, the User Guide often refers
to aspects of the DALI standard.
1.2. DALI Safety Note
By definition, when connected to a lamp interface, DALI is recognised as having basic
insulation from the mains supply only, and is therefore deemed a live connection. In
consequence, the module is constructed to offer a double-insulation rated barrier to the
RS232 serial interface and the user, when correctly installed.
Connection to DALI should be by use of mains-rated cable to a double-insulation
specification and using a shrouded connector. The low voltage power supply to the DALI
components should always be isolated prior to connection to – or work with – the DALI
components. Where appropriate, the use of the Helvar DIGIDIM 180 Programming Point
panel and proprietary connecting lead offers a means of a double-insulation connection,
without powering down the DALI system.
1.3. Isolation
Isolation is 3kV between the RS232 and DALI.
1.4. Byte Format
The byte format is 19,200 baud by default; 8 data bits, no parity and 1 stop bit.
No control or handshaking is used.
1.5. References
‘RS232 to DALI Command List’ (Doc. No. 7860077)
‘RS232 to 900 Lighting Router Command List’ (Doc. No. D004102)
‘RS232 to 900 Digidim Router User Guide’ (Doc. No. ???)
‘RS232 to 910 Digidim Router User Guide’ (Doc. No. ???)
