Rockwell Automation 1771-DB Basic Module User Manual - Series A - Manual (Page 33)

Using the Serial Ports
Chapter 4
4–9
Figure 4.7
Cable Connection to SA/SB Recorder
Output Data – The BASIC Module stops sending characters within 2
character times after receiving an XOFF. Transmission resumes when
XON is received.
Input Data – The BASIC Module sends XOFF when the input buffer
reaches 224 characters. The module sends XON when the buffer contains
less than 127 characters.
The BASIC Module requires CTS (pin 5) to be true before data can be
output. If hardware handshaking is not used with your device then RTS
(pin 4) may be connected to CTS to satisfy this requirement. Jumper pin 4
to pin 5.
Communication between a programmable controller and the T30 Industrial
Terminal using the BASIC Module requires two data transfers. We use
block-transfer-read and write instructions for bi-directional data transfer
between the programmable controller data table and the BASIC Module.
We use an RS-423/RS-232 communication link for bi-directional data
transfer between the BASIC Module and the industrial terminal. Refer to
the Plant Floor Terminal Application Data (publication number 1784-4.1)
for more information.
4.4
Peripheral Port
(continued)
4.4.1
Using the XON/XOFF
Commands for the
Peripheral Port
4.4.2
Connecting A T30 Industrial
Terminal (1784-T30) to the
Peripheral Port