Delta Tau Turbo PMAC PCI-Lite, Справочник по аппаратуре

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Turbo PMAC PCI Lite
14 Machine Connections
General-Purpose Digital Inputs and Outputs (JOPTO Port)
PMAC’s J5 or JOPTO connector provides eight general-purpose digital inputs and eight general-purpose
digital outputs. Each input and each output has its own corresponding ground pin in the opposite row.
The 34-pin connector was designed for easy interface to OPTO-22 or equivalent optically isolated I/O
modules. Delta Tau’s Acc-21F is a six-foot cable for this purpose. Characteristics of the JOPTO port on
the PMAC:
16 I/O points; 100 mA per channel, up to 24V
Hardware selectable between sinking and sourcing in groups of eight. Default is all sinking (inputs
can be changed simply by moving a jumper. Sourcing outputs must be special-ordered or field-
configured)
Eight inputs, eight outputs only; no changes. Parallel (fast) communications to PMAC CPU
Not opto-isolated; easily connected to Opto-22 (PB16) or similar modules through Acc-21F cable
Jumper E7 controls the configuration of the eight inputs. If it connects pins 1 and 2 (the default setting),
the inputs are biased to +5V for the OFF state, and they must be pulled low for the ON state. If E7
connects pins 2 and 3, the inputs are biased to ground for the OFF state, and must be pulled high for the
ON state. In either case, a high voltage is interpreted as a 0 by the PMAC software, and a low voltage is
interpreted as a 1.
Caution:
Do not connect these outputs directly to the supply voltage or damage to the
PMAC will result from excessive current draw.
PMAC is shipped standard with a ULN2803A sinking (open-collector) output IC for the eight outputs.
These outputs can sink up to 100 mA and have an internal 3.3 k pull-up resistor to go high (RP18). A
high-side voltage (+5 to +24V) can be provided to Pin 33 of the JOPTO connector, and allow this to pull
up the outputs by connecting pins 1 and 2 of Jumper E1. In addition, Jumper E2 must connect pins 1 and
2 for a ULN2803A sinking output.
It is possible for these outputs to be sourcing drivers by substituting a UDN2981A IC for the ULN2803A.
This U13 IC is socketed, and so may easily be replaced. For this driver, the internal resistor packs pull-
down instead. With a UDN2981A driver IC, Jumper E1 must connect pins 2 and 3, and Jumper E2 must
connect pins 2 and 3.
Caution :
Having Jumpers E1 and E2 set wrong can damage the IC. The +V output on this
connector has a 2A fuse, F1, for excessive current protection.
The outputs can be configured individually to a different output voltage by removing the internal pull-up
resistor pack RP18 and connecting to each output a separate external pull-up resistor to the desired
voltage level.
Example: Standard configuration using the ULN2803A sinking (open-collector) output IC