Data Communications; Communication Parameters; Protocol - Watlow Ramping and Profiling Microprocessor-Based Control SERIES 1500 User Manual

Data Communications, Commands and Syntax, Chapter 4

Data Communications,

Commands and Syntax
In this section you'll learn the Series 1500 data communications. See Figure 14
Chapter 1 for RS422 and RS423 pin designations, and also for locating and
making the required RS422/423
jumper selection.
The Series 1500 data communications package provides you with a foundation for a
sophisticated communications system based on your system needs and your soft-
ware development. Your Watlow Sales Engineer has available, upon request, a
Series 1500 data communications sample computer program with sample profiles.

Communication Parameters

The Series 1500 with data communications operates with these parameters.
Baud Rate:
Character Format:
Stop Bits:
Parity:

Protocol

You can select one of two hardware interfaces:
1) RS422A for a "multidrop" or (multiple device) network, up to ten devices total;
with 4000' network length limit, or
RS-423A (RS-232C compatible) for one on one communication on a 50' network
2)
need, you must use the correct combination of interface and protocol.
you
We use ANSI X3.28 Protocol, based on ANSI X3.28 - 1976 Subcategories 2.2, and
A3, with the RS-422A
XOFF Protocol, a simpler protocol, to run a two device network with an RS-423A
interface. XON/XOFF Protocol requires no
X3.28 Protocol does.
network is limited to two devices. Likewise, ANSI X3.28 Protocol, which provides a
response to every message, will work with the RS-423 interface. But again you are
limited to two devices.
1200 Baud
7 Data Bits
1 Stop Bit
Odd Parity
interface to run a multiple device network We also use XON/
responses
XON/XOFF will also work with the RS422A interface, but the
to messages like the ANSI
WATLOW Series 1500 User's Manual
in
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