Remote-technologies RPC-320 Manual de usuario descargar pdf (Pagina 20)

RAM MEMORY SECTION 5

Page 5-1 RPC-320

Figure 5-1 RAM and W1 jumper location

INTRODUCTION

32K, 128K, or 512K of RAM may be battery backed on

the RPC-320. RAM size can be changed at any time.

RAM is in socket U5.

RAM is backed up when a DS1216DM is installed.

Battery life depends upon RAM size, its power

consumption, ambient temperature, and amount of time

the board is operating. Generally, a battery life of about

3 to 5 years is e xpec ted . Op er ati ng the boar d at 50 °C

reduces battery life by 1/2.

The DS1216DM is also a real time clock. Thus, DATE

and TIM E function s and com mands a re available when it

is installed. See Chapter 7 for more inform ation.

This chapter discusses changing RAM, saving and

retrieving variables, running assembly language

programs, and battery condition. Figure 5-1 shows the

location of U3 and jumper W1.

Increasing RAM size does not necessarily increase the

program size RPBASIC-52 can handle. Maximum

program and variable size is 60K. Additional RAM does

increase the amount of space available for PEEK and

POKE storage.

CHANGING MEMORY

Different types of memory can be installed at any time.

RPC-320 models come with either 32K or 128K of RAM

installed. Maximum is 512K.

To change a memory chip, you need to rem ove the

original chip, install the new one, and set jumper W1.

To install a new memory chip:

1. Turn off power to the RPC-320.

2. Remove the memory chip from U5.

3. Orient the chip so pin 1 is towards the inside.

If installing a 32K RAM, place the chip at the

bottom

of the socket (m emor y chip pin 1 goes into

socket pin 3). The top two socket pins in each row

are empty.

If installing a 128K or 512K, install the chip into the

socket.

4. Check and change, as necessary, jum per W 1 to

conform to the new mem ory.

RAM size Jumper W1

32K [1-2]

128K [1-2]

512K [2-3]

BATTERY BACKUP

An optional battery backup module may be installed.

Principal is the same as installing a RAM chip.

WARNING:

An additional modification must be performed to the

DS1216DM module when a 512K RAM is installed.

Contact Rem ote Processing for details.

To install a module:

1. Remove the RAM IC in U5.

2. Install the DS1216DM in U5.

3. Re-install the RAM chip into the top of the module.

Checking the battery

Battery voltage is approximately 3.0 volts, measured

between pin 16 (ground) and 30 (128K RAM), 14 and 28

(32K RAM), or 16 and 32 (512K RAM) on the IC itself

(not the circuit side of the board). Be sure to power up

the RPC -320 once to a ctivate the batter y backup cir cuit

in the module.

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