Kantronics KPC–3 Plus User Manual
Also see for KPC-3 Plus: User guideUser guideManual
                                                                                                                                                                                                                                            | |
Contents
| 
221Appendix C: Options for the KPC-3 PlusLow Power OperationYour KPC-3 Plus is capable of very low power operation. In order to achieve the lowestpower consumption possible, you must turn the front panel LEDs off with the commandLEDS OFF. Also, the modem must be set for INTERNAL carrier detection with thecommand CD INTERNAL. In this configuration, the KPC-3 Plus will draw less than 15mA when no signal is being received. Note, however, that the actual current drain mayvary slightly depending on the RS232 connections to the unit. Some computers willcause the current drain to be slightly higher than other computers.If you use software carrier detection (CD SOFTWARE) the current drain will be higher inthe ―idle‖ mode since the processor is actively looking for data even when no signal ispresent.Very Low Power OperationKPC-3 Plus circuitry is powered from a linear low dropout regulator at 5.0 V nominal. Atthis voltage, current requirements vary from approximately 16 mA (unit idle and LEDsOFF) to 23 mA (unit transmitting and LEDs ON). By placing a jumper on J16, the outputof the voltage regulator is reduced from 5.0 V to 3.3 V nominal, thus reducing powerrequirements nearly in half. The current requirements in this case vary fromapproximately 8.5 mA (unit idle and LEDs OFF) to 12 mA (unit transmitting and LEDsON).The 3.3 V mode of operation has not been thoroughly tested in the field and is notguaranteed. The unit may not function properly over extreme temperature ranges whenoperating at 3.3 V.Expanding the RAM in the KPC-3 PlusThe KPC-3 Plus is supplied with 128 KiB of RAM. It is possible to expand the RAM inthe KPC-3 Plus from 128 KiB to 512 KiB.Expanding the RAM to 512 KiB requires that you: (1) remove the existing 128 KiB RAMin socket XU14, (2) change jumper J14 to the center pin and pin 2 (to left of the RAMchip), then (3) install a 512 KiB low-power static RAM in XU14, with the pin 1 end of theIC toward J14.NOTE: in the latest circuit board revision, components are SMT type, and the maximumsize 512K static RAM is standard.Installing the Optional Real-time Clock ModuleThe Real-time clock option for the KPC-3 Plus consists of a FOX 72421 self-containedclock chip. |
This manual is suitable for:
manualsdatabase
Your AI-powered manual search engine