Rockwell Automation 1734-485ASC POINT I/O ASCII User Manual - Manual (Page 27)

1 Publication 1734-UM009B-EN-P - July 2003
Chapter
2
Configuring Your ASCII Module
About Communications The ASCII modules have DeviceNet-to-serial link communication that
provides a flexible DeviceNet interface to a wide variety of ASCII
devices. Used with the POINT I/O system, these modules allow you to
easily and conveniently connect and integrate peripheral products
with RS-232, RS-485, or RS-422 serial ports into a DeviceNet system.
Data can be exchanged with the master through a polled, cyclic, or
change-of-state connection. Bit-Strobe Command Response Messaging
and the Unconnected Message Manager (UCMM) are not supported
1 .
The module produces and consumes data as follows:
1 If you are not familiar with these terms, see the DeviceNet Specification for definitions (online: www.odva.org).
Table 2.1 Produce/Consume Data
I/O Connection Type Consumes Produces
Polled A 4-132 bytes 4-132 bytes
Cyclic A 4-132 bytes 4-132 bytes
Change of State A 4-132 bytes 4-132 bytes
A Default values are 24 bytes.
ATTENTION
!
The ASCII modules are not compatible with the
1734-APB PROFIBUS adapter.