Maple Systems OIT Family (ASCII) - Manual (Page 2)

The purpose of this manual is to describe how the OIT Family Operator Interface Terminals operate when using the
ASCII Slave protocol and to explain the features available. In addition, we recommend you read the following:
• Installation Manual–Covers the installation requirements of your specific OIT Family Operator
Interface Terminal. Each member of the OIT Family has a manual written specifically to its unique
specifications (shipped with each OIT).
• OITware 200 User’s Guide–Covers the operation of the OITware 200 configuration software (shipped
with the OITware 200 configuration software).
• Protocol Guides–Covers information relating to the use of your OIT Family Operator Interface Terminal
specific to each protocol (shipped with the OITware 200 configuration software).
OPERATION
The ASCII Slave protocol is not supported by all of the OIT Family Operator Interface Ter-
minals. This protocol requires an OIT with 32K SRAM and the ability to tristate the RS-485
Tx line when the OIT is operating in network mode. The following OIT Family Operator In-
terface Terminals support the ASCII Slave protocol:
• OIT3160-A00
• OIT3200-B00
• OIT3250-B00
• OIT3600-B00
• OIT4160-A00
• OIT4400-B00
• OIT4450-B00
• OIT5400-B00.
Note: The OIT3200-A00, OIT3250-A00, OIT3600-A00, OIT4400-A00, OIT4450-A00, and
OIT5400-A00 do not support the ASCII Slave protocol without hardware modifications. If you
wish to use the ASCII Slave protocol with these versions, please contact Maple Systems.
Definition of an Operator Interface Terminal (OIT)
Maple Systems OIT Family Operator Interface Terminals are designed to provide the
man-machine interface between an operator and any ASCII compatible computer or host
controller. Any controller that is capable of sending and receiving ASCII characters through
a serial port can potentially communicate to an OIT Family Operator Interface Terminal us-
ing the ASCII Slave protocol. Conventional switches, buttons, and displays are replaced
with a single, compact unit called the OIT. OITs are much more flexible and user-friendly
than switches and buttons, and can be made to perform a number of tasks:
• sound and display alarms
• display messages
• display ASCII strings sent from the ASCII host
• turn LEDs on the OIT on or off
• read and write to the OIT’s internal data and coil registers
• allow the operator to affect the operating conditions of the control system by sending
ASCII strings to the ASCII host.
OPERATION 1
1010-0088, REV02