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FloBoss 103/104 Instruction Manual
5.5 Dial-up Modem Communications Card
5-4
Table 5-2. Communications Card Signals
Signals
RTS
The request to send signals that the modem is ready to
transmit.
RX
The RXD receive data signals that data is being received at
the communications card.
TX
The TXD transmit data signals that data is being transmitted
from the communications card.
Signal wiring connections to the communications card are made through
the terminal block located on the termination board. A nine-terminal
removable connector is used for the wiring of external device
communications.
An EIA-232 (RS-232) communications card in the Comm 2 port
enables you to switch power to external communication devices, such as
a radio, to conserve power. A label on the termination board denotes the
usage of each pin on the connector. Table 5-3 displays connector signals
and their functions.
Table 5-3. EIA-232 (RS-232) Communications Card Wiring
Pin
9
Ring / Transmit data
8
Tip / Receive data
7
Request to Send
3
Ground
2
Switched Power
1
Signal Common Negative
1 Transmit is the FB100's EIA-232 (RS-232) transmission that connects
to the field device's receive.
2 COM at Pin 1 and Pin 3 are identical. They are only separated for ease
of wiring.
3 Switched power is for use with an internal radio or cell phone and not
for power to external devices.
The dial-up modem communications card supports V.22 bis/2400 baud
communications with auto-answer/auto-dial features. The modem card
is FCC part 68 approved for use with public-switched telephone
networks (PSTNs) . A label on the termination board provides the FCC
registration number and the ringer equivalent.
The optional modem communications logic card for the host port
activates Comm 2.
The defaults for the dial-up modem communications card are: 2400
baud rate, 8 data bits, 1 stop bit, no parity, 10 millisecond Key On
Communications
Action
Signal
Label
1
TX
RX
RTS
2
COM
3
B+
2
COM
Revised August-2017
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