INTRODUCTION
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I-E96-217A
®
captive screws on the faceplate secure the module to the MMU.
Front panel LEDs indicate module status to aid in system test
and diagnosis. These include a single module status LED and a
group of four status LEDs. A module reset switch (S1), accessed
through the faceplate, can be used to reset module circuitry.
A permanent RS-232C D connector (port 2) on the module
faceplate provides connection for a computer or modem. A rib-
bon cable routes signals from this connector to socket XU37 on
the PCB. Normally, the faceplate connector provides the com-
puter or modem connection, however, the optional TU can also
be used. This optional TU must be installed to connect a diag-
nostic terminal to the second SPM serial port (port 1).
Three dipswitches mounted on the circuit board set:
•
Module address (S2).
•
Byte framing and parity for both serial ports (S3).
Figure 1-1. INFI 90 Communication Levels
COMMUNICATION HIGHWAY (INFI-NET OR PLANT LOOP)
MODULE BUS
OTHER MODULES
COMMUNICATION
MODULES
TP27279A
MFC
SLAVE
MODULES
(OPTIONAL)
SLAVE EXPANDER BUS
TU
SPM
COMPUTER
DIAGNOSTIC
TERMINAL
(OPTIONAL)
PORT 2
PORT 1