User guide

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73
MODE
When connected to VCC, the motors will rotate continuously as
follows:
SERVO
MODE
DMX
Address
MOTOR A MOTOR B
Lo 1 Position Request N/A
Lo 2 N/A Position Request
Hi 1 Speed N/A
Hi 2 0-127 = Off
128-191 = CW
192-255 = CCW
NA
Hi 3 N/A Speed
Hi 4 N/A 0-127 = Off
128-191 = CW
192-255 = CCW
DMX512
Input
The DMX512 input connects directly to the output of a standard
RS485 or RS422 receiver such as the 75176.
Good Data
The GOOD signal is driven low to show that valid DMX512 data is
being received. The output is suitable for direct connection (via a
current limit resistor) to the cathode of a 20mA LED.
DMX512
Base
Address
The BCD inputs are used to set the DMX base address. The inputs
are set up for connection of three standard Binary Coded Decimal
Thumbwheel switches. The BCD inputs are active low, i.e. to select a
base address of 001, connect UNIT1 to ground and pull up all other
BCD inputs. Valid addresses range from 001 to 512.
The BAS inputs provide an offset to the DMX Base Address. The
purpose
of this is to allow up to four devices to be connected to the same
thumbwheel switches. It is then possible to produce an eight channel
subsystem.
BAS1 BAS0 Add to DMX Base Address
0 0 0
0 1 2
1 0 4
1 1 6