Rockwell Automation 1771-DB Basic Module User Manual - Series A - Manual (Page 13)

Introducing the BASIC Module
Chapter 2
2–3
One RS-423A/232C/RS-422 compatible serial communications port
(PERIPHERAL port), supporting bi-directional XON/XOFF software
handshaking and RTS/CTS, DTR, DSR, DCD hardware handshaking for
interfacing to printers and commercial asynchronous modems. You can
change the peripheral port configuration using a CALL 30. (Refer to
Section 5.8.1). Default values are: 1 start bit, 1 stop bit, 8 bits/character,
no parity, handshaking off and 1200 baud. The baud rate is jumper
selectable (300 to 19.2 K bps). (Refer to Section 3.2.4 titled,
“Configuration Plugs”).
Interface to the 1771 I/O rack backplane to support block-transfer.
Wall clock/calendar with battery back-up available for program access.
Battery replacement without removing the module from the I/O rack.
All power derived from the backplane (1.5 A).
Multiple BASIC modules can reside in the same I/O rack and function
independently of each other.
Your module runs BASIC language programs in an interactive mode
through the dumb terminal/programming port interface, or on power-up.
The execution of these programs allows a direct interface with
programmable controller ladder programs.
Your module uses the following devices and features:
terminal for programming, editing, system commands, displaying data
and interactive program dialog
serial port for report generation output, upload/download to
1770-SA/SB Recorder
PLC-2, PLC-3 and PLC-5 data table reads and writes using
block-transfer
We provide routines to use both the real-time clock and the
wall-clock/calendar. The wall-clock time base is seconds.
2.3
Hardware Features
(continued)
2.4
Software Features