5. Each Component Function
80
User’s Manual
* 4006h: Index address setting
D6
D5
D4
D3
D2
D1
D0
D7
AD0
W
AD1
Figure 5.12. Index Address Setting Port (4006h)
W : Index address setting
When specifying the RS-485 setting with port 4007h, output 00h to this port before you specify
the setting. (* Index addresses other than 00h are used by the system. Do not set addresses except
for 00h.)
* 4007h: Control of RS-485 transmission and reception
D6
D5
D4
D3
D2
D1
D0
D7
rsv*
R/W (Default: XXXX0000b)
RE_GATE TE_GATE TE_SEL
Figure 5.13. RS-485 Transmission and Reception Control Port (4007h)
TE_SEL
: Select the RS-485 transmission enable signal.
0 :
Sets the RTS signal to the RS-485 transmission enable signal. (factory setting)
1 : Sets the TE_GATE value to the RS-485 transmission enable signal.
TE_GATE : RS-485 transmission enable signal. Valid only when the TE_SEL value is "1."
0 : RS-485 transmission
Enable (factory setting)
1
:
RS-485
transmission
Disable
RE_GATE : RS-485 transmission enable signal.
0 : RS-485 reception
Enable (factory setting)
1
:
RS-485
reception
Disable
CAUTION
A bit indicated with "rsv" is used by the system. Do not modify the bit.
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 5.14. Half-Duplex Connection Method
