16
RS-232 TO FIBER OPTIC MULTIPLEXOR
Each signal’s originating device(s) are shown by the letter “O.” Each signal’s
destination device(s) are shown by the letter “D.” Positive voltage is shown by
“+V.” Signal directions are shown by arrows.
Channel is in Mode 1 (Async, 1 Control):
Signal
Local
Local-
Local
Remote
Remote-
Remote
Signal
Device Mux Pin
Mux
Mux
Mux Pin
Device
TXD
O
2
3
D
RXD
RXD
D
3
2
O
TXD
CTS
D
5
20
O
DTR
DSR
D
6
(+V) O
O (+V)
6
D
DSR
Sig. Gnd.
7
7
Sig. Gnd.
DCD
D
8
(+V) O
O (+V)
8
D
DCD
DTR
O
20
5
D
CTS
Channel is in Mode 4 (Internal Sync):
All of the signals shown above, plus these:
TXC
D
15
O
17
D
RXC
RXC
D
17
O
15
D
TXC
Channel is in Mode 2 (Async, 2 Controls), 3 (Triple Async), or 5 (Ext. Sync):
All of the signals shown for Mode 1, plus these:
STXD
O
14
17
D
RXC
TXC
D
15
15
D
TXC
RXC
D
17
14
O
STXD
Table 4-1. Signal Paths (Per Channel)
