User manual

Automation Protocol Interconnections
Miranda Technologies Ltd Page 23
Interconnections
Automation control of Oxtel products uses RS232 or RS422 asynchronous
serial communications.
All Imagestore units have two or more connectors with one being RS232, and
another being RS422 (point-to-point). The connectors on later Imagestore
products, for example Imagestore 750, LGK-3901 and DSK-3901 are
configurable to different serial types including RS232 and RS422. Set up of
serial ports (i.e. protocol, baud rate, and for later products, serial type) is
covered in individual User Manuals for each product.
Cable
All interconnection cables attached to Oxtel units should be constructed
following best practice for the purposes of electromagnetic compatibility
(EMC).
Cables should always feature a screening braid fabrication, and always be
terminated with metal shrouded connectors. The fully screened cable must
have a metal/foil shroud completely surrounding the internal wiring within
the terminating connectors. This shroud must be connected directly to the
cable’s screening braid. This connection must be as close to 360 degrees
around the cable as possible. Connections using thin wires or drain wires
should not be used, since they provide inadequate screening.
To conform with broadcast standard earthing/grounding arrangements, the
cable screen should only be connected to ground at one end via the connector
shroud.
Pin Assignments
RS232
The RS232 connector is a 9-way male D-type, which follows the same pin
assignments as the standard IBM PC/AT serial port, as shown in the
following table: