104
ICC
8.8.7
DMX-512 Slave
To configure the gateway for DMX-512 Slave, click on the
RS-485 Configuration
tab and select
DMX-512 Slave
in the protocol dropdown menu. The DMX-512
Slave configuration consists of assigning database bytes to channel numbers that
the gateway will occupy in the DMX universe. Each byte in the database
corresponds to one channel in the DMX packet. The starting channel number, or
DMX start address, may be any number between 1 and 512.
8.8.7.1
Protocol Selection Group
Address
This field is the DMX start address. Enter a value between 1 and 512.
Timeout Time
Refer to section 8.3.1.
8.8.7.2
DMX Data Configuration
Database Start Address
This field is the location in the database where the channels will be mapped
starting with the channel defined by the address field.
Num Channels
This field is the number of consecutive channels to map into the database.
Channel numbers up to 512 may be mapped.
8.8.7.3
Configuration Example
This example will configure the gateway for end-to-end communication using
DMX-512 Slave and Modbus/TCP Client.
Say, for instance, a stage setup has a variety of DMX-enabled lights and a set of
props controlled by a Modbus/TCP-enabled servo motor. The operator wishes to
control both the lights and the servo motor using the same DMX controller. The
gateway can be used to convert the DMX control signals to Modbus/TCP
commands to control the servo motor from the DMX controller.
The servo motor is controlled by two Modbus registers, 100 and 101, which
control the X and Y position of the props. The lights occupy channels 1 to 48 on
the DMX controller. Because Modbus registers use two database bytes and DMX
channels use only one, each Modbus register will map to two DMX channels in
the gateway. By setting the gateway’s database endianness to big endian, the
operator of the DMX controller can have coarse and fine adjustments to the X
and Y position of the props using two channels per position.
Configure the Ethernet port using the above requirements
•
Connect the gateway to the PC via a USB mini type-B cable.
