Rockwell Automation 1771-DB BASIC MODULE - Manual (Page 4)

Preface A
Summary of Changes
SOC-2
EEPROM Programming Support
The Series B module has two sockets for memory modules: one for
EEPROM and the other for EPROM. Program and erase EEPROM
memory modules with the Series B module. You no longer have to use
CALLs 8 and 9 to burn your EEPROM.
Also, you can read and run the EPROM memory module (8K, 16K, and
32K) you programmed with your Series A module on the Series B.
However, you cannot program an EPROM on the Series B.
See Chapter 3 for more information.
Additional RAM Memory
The Series B module has increased RAM to 24K bytes; Series A had 13K.
Five New LED Indicators
The Series B module has increased the number of troubleshooting LEDs
from 5 to 10. The LEDs now indicate when PRT1 and PRT2 are either
transmitting or receiving. The ACTIVE light now flashes when you are in
Command mode and remains on when you are in Run mode. Plus, you
now have two user-defined LED indicators.
See Appendix C for more information.
Two Fully Functional Serial Ports
Ports PRT1 and PRT2 can be configured independently for RS-232,
RS-422, or RS-485. For Series B, you do not need to jumper pins 4 and 5
together on PRT2 for printing.
Software handshaking is enabled as a default on Series B, but not Series A.
See Chapter 2 for more information.
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