UCC I/O-Interface ("IOI") Specification
IOI Version 1.1.0
2013-10-24 V1.0.0 (KG) introduced
2013-11-29 V1.1.0 (KG) expanded and restructured
1. IOI device
The I/O Interface (IOI) is an FPGA-based multi-purpose control and sensing I/O interface.
In addition to 24 individually configurable general purpose I/O lines (GPIOs) it provides one (with handshake) or two (without handshake) multi-purpose RS-232 and two multi-purpose RS-485 ports, operated by individual multi-mode UART modules.
GPIO lines can either use the internal +5V or an externally supplied pullup voltage for all GPIO lines; Each GPIO may also use its own pullup or signal voltage up to +24V.
The 24 GPIOs are grouped into 6 ports with 4 lines each in a pluggable terminal block, with a GND and Vdc terminal block on either side.
All ports are under software control by the UCC host controller and configuration is done in software.
2. IOI power supply
CAUTION: Common GND is used for UCC, SCLAN and all I/O!
IOI Power supply options:
+5V logic supply:
» Host Vcc jumper set (default): from UCC host
» Host Vcc jumper open: external through separate logic Vcc input
I/O Vdc supply:
» I/O Vdc jumper set (default): use +5V logic Vcc
» I/O Vdc jumper open: external through separate I/O Vdc input
3.1. general-purpose I/O (GPIO)
I/O * 24:
» 6 ports A..F with 4 signals each (A1..4, B1..4, C1..4, D1..4, E1..4, F1..4)
» all 24 ports individually configurable as:
» open drain pull-down switch output (max. 1.7A)
» open drain pull-down PWM output (max. 1.7A)
» pull-down switching input (4.7k Ohm pull-up to Vdc)
» LED status indicator for each I/O:
» red: output active
» green: input active
» all I/O common GND, common I/O Vdc
NOTE: The Vdc pullup is coupled to each I/O line with a diode, so external signals or pullups for each line can go to max. 24V regardless of Vdc. For external signals above that, a voltage divider or reduction diode must be used.
Potential separation must be provided externally (via optical couplers, for instance).
» up to 24 individual channels
» configurable resolution: 2..65536 levels (example: precisely 1000 levels)
» configurable period frequency
» up to 762Hz at full resolution
» up to 25MHz at lower resolutions
4: RTS1 / TXD2
6: CTS1 / RXD2
10: GND (shield)
» RS-232 * 1 with RTS/CTS handshake (crimped cable to DB-9 male D-Sub connector)
» RS-232 * 2 without handshake (special Y cable)
3.2.1. multi-mode UART
» speed: 95..6250000 baud
» noise rejection
» universal pattern generation / detection
» autonomous loop mode (DMX etc.)
» auto response
» bytestream filter
» separate speeds and operation modes possible for input and output
RS-485 (1, 2) (5V differential):
A jumper for each port terminates A, B with 120 Ohm.
Each RS-485 port has a multi-mode UART (see 2.2.1).
» serial port / bus:
» full multi-mode UART capabilities
» bus mode with collision detection and arbitration support
» special frames
» No termination (jumper open)
» RS-485.1 -> DMX.1
» RS-485.3 -> DMX.3
» RS-485.4 -> DMX.2
» up to 2000 channels (if supported by devices)
» jitter-free (autonomous loop mode)
» full speed (zero unwanted latencies)
» DMX standard compliant
» adaptations to device limitations remain possible