5. Each Component Function
User’s Manual
81
RX-(11)
RX+ (3)
TX-(10)
TX+ (2)
0 : Controlled by RTS
TE_SEL
1 : Controlled by TE_GATE
VCC
TXD
47k
Ω
6.2k
Ω
0 : Transmission prohibited
RTS
1 : Transmission permitted
0 : Transmission permitted
TE_GATE
1 : Transmission prohibited
0 : Receiving permitted
RE_GATE
1 : Receiving prohibited
RXD
6.2k
Ω
47k
Ω
1
2
3
JP4
0
1
R
D
120
Ω
Figure 5.15. Full-Duplex Connection Method
External I/O Circuit
4.7k
Ω
1/4W
External power
(12V - 24VDC)
Input
contact
(PCOM)
(PI 0 - 2)
RAS connector
(External circuit)
PC817
Internal
reset
(IN)
4.7k
Ω
Figure 5.16. Input Circuit
(PO 0 - 2)
(NCOM)
External power
(Max. 30VDC)
(External circuit)
RAS connector
PC817
Lard
510
Ω
4.7k
Ω
2N3904
Figure 5.17. Output Circuit