B&B Electronics Four Port 사용자 설명서
Documentation Number 3PCISD4x-3903 Manual
Appendix A
A-1
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445
Appendix A: DB9 Signal Connections
With 2-wire RS-485 mode operation, your connection cable must
jumper RD(A) to TD(A) and RD(B) to TD(B). Connect from TD(A) &
TD(B) to the Data A(
jumper RD(A) to TD(A) and RD(B) to TD(B). Connect from TD(A) &
TD(B) to the Data A(
−
) and Data B(+) wires of your RS-485 network.
The EIA RS-422 Specification labels data lines with an "A" and "B"
designator. Some RS-422 equipment uses a "
designator. Some RS-422 equipment uses a "
−
" and "+" designator.
In almost all cases, the "A" line is the equivalent of the "
−
" line and
the "B" line is the equivalent of the "+" line. See our RS-422/485
Application Note (available on our websites).
Application Note (available on our websites).
Table 7: RS-232 Pinouts
RS-232
Signal
Description Direction
DB9M
Pin
DCD Data
Carrier
Detect
input
1
RD Receive
Data
input
2
TD Transmit
Data
output 3
DTR Data
Terminal
Ready output
4
GND Signal
Ground
----
5
DSR
Data Set Ready
input
6
RTS Request
to
Send
output
7
CTS
Clear to Send
input
8
RI Ring
Indicator
Input 9
Table 8: RS-422/RS-485 Pinouts
RS-422
signal
Description Direction DB9M
Pinout
-- --
1
RD(A)
−
Receive Data A
input
2
TD(A)
−
Transmit Data A
output
3
-- --
4
GND Signal
Ground ----
5
-- --
6
TD(B) +
Transmit Data B
output
7
RD(B) +
Receive Data B
input
8
-- NA
9
A-2
Appendix A
Documentation Number 3PCISD4x-3903 Manual
B&B Electronics Mfg Co – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
B&B Electronics Ltd – Westlink Comm. Pk. – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445