Manual OC32/NG
VPEB
Control your Miniature World
Page 12 of 48
Version 1.0 – December 15
th
, 2017
2017 Leon van Perlo
3
Overview
3.1
Interfaces and functions
Fig 5: OC32/NG overview interfaces and functions
On the OC32/NG the following interfaces and functions can be found:
Interfaces:
•
I/O Pins: Two 20-pole connectors (K5A, K5B) accommodate four 10-pin plugs for 32 I/O
Pins and power supplies/GND;
•
RS485 interface, two RJ45 sockets (K2A, K2B) and one 3-pole socket (K2);
•
DCC interface (K3) (optional);
•
Event input interface (K4) (optional);
•
Four pole connector for power supply and RS232 interface (K1);
•
Serial Accessory Port: The connection to control special serial devices;
On the PCB:
•
4 pairs of IC-sockets for driver-ICs. Each group of 8 outputs has one socket for a
Source Driver and one for a Sink Driver;
•
4 pairs of sockets for Add-on Driver Modules (ADM’s). ADM’s can be used instead of
driver-ICs to increase output power and for additional functions;
•
Indicator LEDs, orange and green;
•
DIPswitch: A dipswitch with six positions to select the address of the module;
LED Green
LED Orange
Reset jumper
RS485
interface
RS232
interface
Power
Serial Address
Selection
I/O
Pins
Sink 0..7
Source 0..7
Sink 16..23
Source 16..23
Sink 8..15
Source 8..15
Sink 24..31
Source 24..31
RS485 Termination
Power Jumper 16..31
DCC Interface
Event
Inputs
Serial Accessory Port
RS485
interface
DCC Low-
Pass Filter
ETI Opto
ADM Sockets
Power Jumper 0..15
K2A
K2B
K1
K2
K3
K4
K5A
K5B
LED Green
LED Orange
Reset jumper
RS485
interface
RS232
interface
Power
Serial Address
Selection
I/O
Pins
Sink 0..7
Source 0..7
Sink 16..23
Source 16..23
Sink 8..15
Source 8..15
Sink 24..31
Source 24..31
RS485 Termination
Power Jumper 16..31
DCC Interface
Event
Inputs
Serial Accessory Port
RS485
interface
DCC Low-
Pass Filter
ETI Opto
ADM Sockets
Power Jumper 0..15
K2A
K2B
K1
K2
K3
K4
K5A
K5B
Control your Miniature World
VPEB
Manual OC32/NG
2017 Leon van Perlo
Version 1.0 – December 15
th
, 2017
Page 37 of 48
6.4
Example-connections
Provided the required voltages and currents are within the limits of the OC32 it can drive all
devices you may encounter. Most parts like incandescent bulbs, LEDs and relays can be
connected directly. With some simple extra components other things can be driven like
decouplers, turnout coils and motors. Below you find a number of examples of devices to be
found in the miniature world are presented.
6.4.1
LED’s with common anode (+)
OC32 I/O Pin: 500mA Sink Driver
Connect the common connection to the positive power
terminal (Vp = pin 28/29 of K5). Connect the cathodes
of the separate LEDs via a resistor to the output of
the OC32.
When only one LED is lit simultaneously (like with NS 3
color signals or block signals), the resistor can be in
the common lead and the cathodes of the LEDs are
connected directly to the output of the OC32.
The value of the resistor depends on the voltage (Vp), the current required by the LED and
how bright you want the LED to shine. In case of ready built signals (for example Viessmann)
those resistors are incorporated and the voltage is prescribed. In our opinion the 1,2k
Ω
applied by Viessmann at 14..16V results in to much light, especially when the surroundings
are in the dark. With this value of the resistor and the built-in LEDs the result is much more
attractive at a voltage level of 9..10V. With 14V a resistor of 1,8k
Ω
or 2,2k
Ω
can do the
trick.
Just experiment at day and night time before installing things definitively or use an
adjustable power supply
When more than one LED has to be connected to one output, connect the LEDs in series if
possible. Otherwise provide each LED with its own resistor and connect several LED and
resistor combinations in parallel.
6.4.2
LED’s with common cathode (-)
OC32 I/O Pin: Resistor-array
Connect the common lead to the GND/0V. Connect the
anode of the individual LEDs to the outputs of the
OC32. A resistor is not required because it is in the
OC32. Use a resistor array with a value of 220
Ω
. Low-
current LEDs being used a higher value of the resistor
array has to be applied.
6.4.3
Incandescent Bulbs
OC32 I/O Pin: 500mA Sink Driver
Bulbs have to be connected between the positive
voltage (Vp) and the OC32 outputs. A resistor is not
needed. The voltage (Vp) has to match the voltage
required by the lamp. Having more individual bulbs in
the same casing (e.g. a signal) the common lead has to
be connected to Vp and the individual connections to
outputs of the OC32. If bulbs have to be switched
Fig 25: Connecting LEDs common.Anode
Vp
Q(x+2)
Q(x)
Q(x+1)
Rv
Vp
Q(x+2)
Q(x)
Q(x+1)
Rv
Fig 26: Connecting LEDs common Cathode
GND
Q(x+2)
Q(x)
Q(x+1)
GND
Q(x+2)
Q(x)
Q(x+1)
Fig 27: Connecting incand. bulbs
Vp
Q(x+2)
Q(x)
Q(x+1)
Vp
Q(x+2)
Q(x)
Q(x+1)
