3.2
TTL-Outputs
Also on the board, 8 TTL-compatible digital outputs are located at a 10pin single-row header.
Important
: The TTL-outputs are not short circuit protected.
Never apply any voltage to these pins and avoid electrostatic discharge when touching or connecting
the pins. Otherwise, the board can be damaged.
Also do not use more than 50mA of current at the 5V supply pin.
Pins
1
GND
Device ground
2
Data 8
TTL-Bit 8 (MSB)
3
Data 7
TTL-Bit 7
4
Data 6
TTL-Bit 6
5
Data 5
TTL-Bit 5
6
Data 4
TTL-Bit 4
7
Data 3
TTL-Bit 3
8
Data 2
TTL-Bit 2
9
Data 1
TTL-Bit 1 (LSB)
10
VCC
Internal supply v5V
When using the signals to connect external devices, it is recommended to use additional TTL-
drivers (74HCT241 or 74HCT244) or optocouplers to protect the circuit.
Note:
The TTL signals are not wired to the external connector (9 pin DSUB) of the boxed device!
3.3
DMX-Signals
The DMX signals are located at a 10pin expansion connector.
The line drivers for DMX are already located on board!
Normally, the signals 'In+', 'In-', 'Out+' and 'Out-' will be used for DMX.
In special cases, for example if an isolated DMX-adaptor (option) is used, an additional circuit is
necessary. In this case, the signals in brackets () will be used. These signals use TTL-level and
cannot be used to drive DMX-cables directly!
To avoid collision between exernal and internal line drivers, a bridge is located on board.
This is a resistor with 0 Ohms (marked red in boardlayout Fig. 2).
When using external, active DMX circuits, like the isolated option, this bridge has to be
removed!
Pins
1
VCC
internal supply v5V
2
TXD
not used
3
(DMX In)
DMX-In from external line driver circuit (TTL-level)
4
(DMX Out)
DMX-Out to external line driver circuit (TTL-level)
5
DMX In+
DMX-input plus
6
DMX Out+ DMX-output plus
7
DMX In-
DMX-input minus
8
DMX Out-
DMX-output minus
9
RXD
not used
10
GND
device ground
11
