PMAC2A-PC/104
Machine Connections
17
Jumper E7 on the ACC-1P board 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'.
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
Ω
pull-up resistor to go high (RP18).
Do
not connect these outputs directly to the supply voltage, or damage to the PMAC will result from
excessive current draw.
The user can provide a high-side voltage (+5 to +24V) into Pin 33 of the J7
connector, and allow this to pull up the outputs by connecting pins 1 and 2 of Jumper E1. Jumper E2
must also 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 U7 IC is socketed, and so may easily be replaced. Usually the U7 IC is offset by two pins on its
socket, and so pins 1 and 2 usually remain open.
WARNING
Having Jumpers E1 and E2 set wrong can damage the IC.
The +V output on this
connector has a 2 A fuse, F1, for excessive current protection.
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.
Example:
Standard configuration using the ULN2803A sinking (open-collector) output IC
Further software settings are required to configure this port. See the
Software Setup
section for details on
this.
ACC-2P General-Purpose Digital Inputs and Outputs (JOPT Port)
ACC-2P JOPT connector provides sixteen lines of general-purpose I/O. In contrast with the ACC-1P J7
connector, the lines on the ACC-2P JOPT connector are limited to TTL levels and are usually used with
external I/O modules. Each I/O line 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 Accessory 21F is a six-foot cable for this purpose.
Jumpers E9 and E10 on the ACC-2P board select the I/O lines direction of the JOPT connector. This
allows configuring this port as all inputs, all outputs or half inputs and half outputs. Further software
settings are required to configure this port. See the
Software Setup
section for details on this.
ACC-1P Thumbwheel Multiplexer Port (J2 Port)
The Thumbwheel Multiplexer Port, or Multiplexer Port, on the J2 connector has eight input lines and
eight output lines. The output lines can be used to multiplex large numbers of inputs and outputs on the
port, and Delta Tau provides accessory boards and software structures (special M-variable definitions) to
capitalize on this feature. Up to 32 of the multiplexed I/O boards may be daisy-chained on the port, in
any combination. Either the ACC-1P or the ACC-2P boards, but not both, can use this connector as a
Input switch
MI1
M01
15
16
31
33
34
J7
-
+
Load (100 mA max)
GND
GND
+V
+ -
Optional 5 to 24 Volts
DC power supply
Summary of Contents for PMAC2A-PC/104
Page 2: ......
Page 14: ...PMAC2A PC 104 Base Board Hardware Setup 8 ...
Page 34: ...PMAC2A PC 104 PMAC2A PC 104 Software Setup 28 ...
Page 41: ...PMAC2A PC 104 ACC 1P Hardware Reference Summary 35 ...
Page 51: ...PMAC2A PC 104 Base Board E Point Jumper Descriptions 45 ...
Page 55: ...PMAC2A PC 104 Acc 1P E Point Jumper Descriptions 49 ...
