User`s manual

PK2100
I/O Configurations s 3-13
The diodes on U35 for outputs O8O10 use the PK2100s power supply
directly.
Inductive
load
D.C. in D.C. in
Digital output
channels O8O10
Figure 3-13. Routing PK2100 Power Supply
for Digital Outputs O8O10
The drivers used are the Motorola MC1413B or the equivalent Texas
Instruments ULN2003. One drives outputs O1O7, and the other drives
outputs O8O10, the onboard relays and the beeper. Each driver chip can
dissipate a maximum of 1.25 watts when the ambient temperature is 60°C.
Each output consumes power, depending on the current, as follows.
100 mA 0.10 W
200 mA 0.25 W
350 mA 0.50 W
This limits the maximum current to approximately 150 milliamps per
output if all outputs are turned on at the same time for a 100 percent duty
cycle. The maximum current for any single output is 500 milliamps.
Analog Output
One analog output (DAC) is provided. With Pins 2-3 on Jumper J7
connected, the output can be a voltage (010 volts for PK2100/PK2120
and 07volts for PK2110/PK2130); connecting Pins 1-2 on Jumper J7
turns the output into a current output suitable for driving current loops at
420 mA. The analog output will drive 20 milliamps (15milliamps for
PK2110/PK2130) up to 470 Ω with a resolution of 10bits.
Another 10-bit analog output channel (UEXP) is available if it is not being
used to support the universal inputs.
Communication Interfaces
The PK2100 comes with a full-duplex RS-422/RS-485 serial port that can
operate asynchronously at up to 38,400 baud (57,600 with the optional
9.216-MHz clock upgrade). An RS-232 serial port with two handshaking