Contec BX710 Series User Manual page 115

5. Each Component Function
* 4007h: Control of RS-485 transmission and reception
D7 D6 D5
Figure 5.14. RS-485 Transmission and Reception Control Port (4007h)
TE_SEL : Select the RS-485 transmission enable signal.
0 :
1 :
TE_GATE : RS-485 transmission enable signal. Valid only when the TE_SEL value is "1."
0 :
1 :
RE_GATE : RS-485 transmission enable signal.
0 :
1 :
CAUTION
A bit indicated with "rsv" is used by the system. Do not modify the bit.
TXD
TE_SEL
0 :Transmission
RTS
prohibited
1 :Transmission
permitted
0 :Transmission
TE_GATE permitted
1 :Transmission
prohibited
0 :Receiving
permitted
RE_GATE
1 :Receiving
prohibited
RXD
RS485 Terminator
Enabled : On
Control
Disabled : Off
Figure 5.15. Half-Duplex Connection Method
108
D4 D3 D2
RE_GATE TE_GATE TE_SEL
Sets the RTS signal to the RS-485 transmission enable signal. (factory setting)
Sets the TE_GATE value to the RS-485 transmission enable signal.
RS-485 transmission
RS-485 transmission
RS-485 reception
RS-485 reception
0 : Controlled by RTS
1 : Controlled by TE_GATE
0
1
R
120kΩ
D1 D0
rsv*
R/W
Enable (factory setting)
Disable
Enable (factory setting)
Disable
D
(Default: XXXX0000b)
RX-(11)
RX+(3)
TX-(10)
TX+(2)
BX710 series User's Manual