
I-E96-217A
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SECTION 1 - INTRODUCTION
OVERVIEW
The Serial Port Module (IMSPM01) is a microprocessor based
INFI 90 module that interfaces a computer with INFI 90 mod-
ules in a Process Control Unit (PCU). An SPM communicates
with other modules over a module bus. Built-in SPM functions
support Bailey Controls computer or Engineering Work Station
(EWS) software commands. These functions allow computer
access to module configuration I/O and status information. An
IMSPM01 is a direct functional replacement for the Network 90
NSPM01.
Using an SPM and Bailey Controls software, a computer can
perform tuning and configuration functions, monitor module
status and transfer data between it and modules (up to 31)
connected to the module bus.
The SPM drives two serial ports: port 1 and port 2. The com-
puter can be connected directly or through a modem to port 2
at the faceplate RS-232C connector. This direct connection
capability eliminates the need for additional termination hard-
ware and cabling.
An optional Termination Unit (TU) with RS-232C connectors
can be installed to connect a diagnostic terminal to port 1 on
the SPM. A diagnostic terminal can be used to verify module
bus communication, and to perform SPM tests.
When the SPM is installed in a PCU without the optional TU,
the computer or modem connects to the faceplate RS-232C
connector. Installing the SPM with the optional TU allows com-
puter or modem connection to either the faceplate connector or
a TU connector.
Figure
illustrates the INFI 90 communication levels and
the position of the SPM within these levels.
INTENDED USER
System engineers and technicians should read this manual
before installing and operating the SPM. A module should
NOT
be put into operation until this instruction is read and under-
stood. Refer to the Table of Contents to find specific informa-
tion after the module is operating.
MODULE DESCRIPTION
The SPM is a single printed circuit board that occupies one slot
in a standard INFI 90 Module Mounting Unit (MMU). Two