Manual OC32/NG
VPEB
Control your Miniature World
Page 4 of 48
Version 1.0 – December 15
th
, 2017
2017 Leon van Perlo
Contents
1
OC32 - Introduction ......................................................................................... 7
1.1
A different approach........................................................................................ 7
1.2
Functions ....................................................................................................... 7
1.3
OC32 I/O Pins ................................................................................................. 8
1.4
Communication ............................................................................................... 8
1.5
DCC ............................................................................................................... 8
1.6
ETI ................................................................................................................. 9
1.7
SAP ............................................................................................................... 9
1.8
Physical properties.......................................................................................... 9
2
Practical Notes ............................................................................................. 10
2.1
Opening and closing the enclosure .................................................................. 10
2.2
Using the connectors .................................................................................... 10
3
Overview ....................................................................................................... 12
3.1
Interfaces and functions ................................................................................ 12
3.2
LED indicators .............................................................................................. 13
4
Power Supplies .............................................................................................. 14
4.1
General ........................................................................................................ 14
4.2
Some words about power supplies:................................................................. 14
4.3
GND or reference voltage .............................................................................. 15
4.4
Connecting power to the OC32 ...................................................................... 15
4.4.1
The standard method: through K1........................................................... 15
4.4.2
Use of separate power supplies for OC32 and connected devices .............. 15
4.4.3
Providing power to the OC32/NG via K5A or K5B...................................... 16
4.5
5V ............................................................................................................... 16
4.6
Use of model railroad- and other transformers ................................................ 17
4.6.1
Use of a locomotive transformer ............................................................. 17
4.6.2
Rectification and smoothing of an AC voltage ........................................... 17
5
Communicating with the OC32........................................................................ 19
5.1
Ways of communication ................................................................................. 19
5.2
Addressing of multiple OC32 modules (serial communication) ........................... 20
5.2.1
Addressing (normal) ............................................................................... 20
5.2.2
Adressing (extended)..................................................................................... 21
5.3
RS485 communication .................................................................................. 21
5.3.1
RS485 general explanation ..................................................................... 21
5.3.2
RS485 on the OC32/NG ......................................................................... 21
5.3.3
RS485 Termination ................................................................................ 22
5.3.4
Connecting to a PC via RS485 ................................................................ 22
5.3.5
Connecting multiple OC32/NG’s to a PC – Option 1................................... 23
5.3.6
Connecting multiple OC32/NG’s to a PC – Option 2................................... 24
5.3.7
Connecting multiple OC32/NG’s – Other options....................................... 25
5.3.8
The OC32/NG in a Dinamo(/MCC) system.................................................. 25
5.3.9
The installation of a “real” RS485 network............................................... 25
5.4
RS232 communication .................................................................................. 25
5.5
DCC control.................................................................................................. 26
5.6
Additional Options ......................................................................................... 27
5.6.1
TTL Level serial input .............................................................................. 27
5.6.2
Dual RS485 interface............................................................................. 28
6
Connecting the I/O Pins .................................................................................. 30
6.1
Selecting the electrical characteristics .......................................................... 30
6.1.1
Sink Drivers 500mA (TBD62083) ............................................................ 31
6.1.2
Source Drivers 500mA (TBD62783)........................................................ 31
6.1.3
Sink and Source Drivers (TB TBD62783) .................................. 32
6.1.4
Resistor Array (5V outputs) ................................................................... 32
6.1.5
OC32-ADM/SI (4,8A power sink-driver) .................................................... 33
6.1.6
OC32-ADM/SO (4,8A power source-driver) .............................................. 33
Control your Miniature World
VPEB
Manual OC32/NG
2017 Leon van Perlo
Version 1.0 – December 15
th
, 2017
Page 45 of 48
If the OC32 is controlled from another OC32, OM32 or Lichtorgel, the ‘A’ wire should be
connected to the 500mA output port of that device. That output port may not be
connected to anything else and the controlling device must be connected to the same GND.
8.3
Optocoupler
An optocoupler can be used if the event input ports are activated from any other electrical
system. In this case, the “A” and “K” connection of each input port is respectively the
Anode and Cathode of the IR diode of an optocoupler.
The maximum current through the input port optocoupler is 50mA. However, this maximum
current is never needed. Therefore the advice is to stay far below this maximum. The input
port is reliably triggered by a current from 1mA up. There are many ways to drive an
optocoupler. It is far beyond the scope of this manual to describe all possible circuits. As an
example we describe the possibility to control the input port from a pushbutton or other
type of switch.
Fig 45: Connecting the Optocoupler input
If you find it difficult to calculate the series resistor Rv, please have a look in the FAQ on
www.dinamousers.net
A simple calculation: Rv = (V - 2) / 5 gives the approximate value of Rv in k
Ω
that will result in
a current of 5mA through the optocoupler.
V is the voltage on the “+” terminal. When using a
voltage of 12V the formula gives 2k
Ω
for Rv (thus practically a 2k2 from the E12 series)
Fig 43: Pushbutton on Event Input (1)
Fig 44: Pushbutton on Event Input (2)
OC32
In x
A
K
IR diode
+
Rv
OC32
In x
A
K
IR diode
+
Rv
OC32
To CPU
In x
A
K
OC32
To CPU
In x
A
K
OC32
To CPU
In x
GND
A
OC32
To CPU
In x
GND
A
