DESCRIPTION AND OPERATION
FSK OPERATION (IMFEC11 ONLY)
2 - 8
WBPEEUI240756A0
®
FSK OPERATION (IMFEC11 ONLY)
The digital interface, made up of the IMFEC11 module and the
controlling module, provides a communication path between
an INFI 90 OPEN operator interface and Bailey-Fischer & Por-
ter smart transmitters as shown in Figure
. Commands can
be sent from an operator interface to change transmitter
parameters or to rerange a transmitter output. In return, the
transmitters send process and status data to the operator
interface through the FEC module and controlling module
(MFP/MFC). The controlling module communicates with the
FEC module over the I/O expander bus.
SMART TRANSMITTER
FSK smart transmitters communicate with the IMFEC11 mod-
ule at a rate of 9600 baud. To prevent changes to the transmit-
ter configuration during normal operation, the module sends a
Figure 2-5. FSK Signal and Decoded Digital Equivalent
FSK INPUT SIGNAL AT 9600 BAUD
t = 0
t
t
DIGITAL OUTPUT FROM DECODING LOGIC
TP25184A
f
1
1
f
1
1
f
1
1
f
1
1
f
1
1
f
0
0
f
0
0
f
0
0
Figure 2-6. Field Bus Mode
NTFB01
SMART TRANSMITTERS USING
FSK COMMUNICATION AND
SENDING DIGITIZED DATA
FIELD BUS
BCN
PTS
EQN
PTS
TBN
PTS
T00916A
IMFEC11
