6. About Hardware
COM-1(PM), COM-1D(PM)
37
Equivalent circuit
TxD, RTS, DTR
RxD, CTS, DSR, DCD, RI
LT1133
Figure 6.1. Equivalent Circuit <COM-1D(PM)>
6.2k
Ω
6.2k
Ω
47k
Ω
47k
Ω
100
Ω
RxD, CTS
TxD, RTS
LTC491(RTS/CTS), LTC490(TxD/RxD)
Figure 6.2. RS-422A/485 Full Duplex Connection <COM-1D(PM)>
6.2k
Ω
6.2k
Ω
47k
Ω
47k
Ω
100
Ω
TxD, RxD
LTC491
Figure 6.3. RS-422A/485 Half Duplex Connection <COM-1D(PM)>