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FloBoss 407 Instruction Manual
Rev 5/00
4-5
C18
U7
Y2
U6
U5
1
2
30
P8
30
2
1
J2
U10
U9
R23
LEASED LINE/RADIO MODEM
C27
R24
R25
C26
CR6
Y1
RP1
RTS
RP2
C28
COM PORTS
C29
FB5
C25
C23
C24
C22
FB6
P7
3
5
7
1
R20
R16
R6
R15
R18
R19
R22
R21
C17
CR8
CR7
R17
30
2
1
P1
U3
U1
2W
2
C9
30
2
1
J1
FB3
FB2
FB4
C8
C6
C5
U4
CR1
CR2
CR3
CR4
CR5
TXD
DCD
CTS
DTR
R
X
D
C7
C11
C10
C13
C14
W1
C12
GND
4W
4W
2W
4W
2W
ISO
R10
R9
R12
R7
R8
R11
4
2
4
P6
C16
R14
R13
C15
P5
4
2
P4
4
2
C1
FB1
U2
R1
R2
C2
C4
P3
R26
R5
T2
T1
C19
U8
C20
C21
VR6
VR5
VR4
VR3
VR2
VR1
P2
1
DOC0247A
4.2.3 Radio Modem Communications Card
The Radio Modem Communications Card sends and receives full duplex or half-duplex, asynchronous
Frequency Shift Keyed (FSK) signals to the audio circuit of a two-way radio. The modem incorporates
a solid-state push-to-talk (PTT) switch for keying the radio transmitter. Refer to Figure 4-3.
LED indicators on the card show the status of the RXD, TXD, DTR, DCD, CTS, and RTS
control lines. LED indicators are detailed in Table 4-1.
There is one jumper (P6) which determines whether the PTT signal is isolated or grounded. Refer to
Section 4.4.3 for more information.
LED INDICATORS
Figure 4-3. Radio Modem Communications Card
Содержание Fisher FLOBOSS 407
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