Table of Contents
Advertisement
INSTALLATION
REMARKS
The DB9 pinout described in the table below is defined by the PROFIBUS
Standard DIN-19-245 Part 1.The two data signals are named RXD/TXD+ and
RXD/TXD-. However, manufacturers of RS-485 driver ICs typically refer to
these signals as A and B'. The PROFIBUS signal RXD/TXD+ is typically
assigned to the RS-485 signal A and the RXD/TXD- to B'. Some PROFIBUS-DP
implementations confuse these two signals. If you are having trouble
establishing communications from the FR-A5NP to your PROFIBUS-DP master,
verify that the proper data signal assignments are made. It may be necessary to
swap these two signal lines.
DB-9
A5NP Internal
Pin
Signal Name
1
NC
2
NC
3
A
4
RTS
5
Isolated GND
Isolated +5Vdc
6
Supply
7
NC
8
B'
9
NC
NC — No Connection
(6) To terminate the network at the option unit, install termination resistors
at the terminal block as shown in Figure 2-5. Each PROFIBUS network
has two ends. Units at both of those ends must be properly terminated.
PROFIBUS-DP
Signal Name
No Connection
RP
Reserved for Module Power
RxD/TxD+
Receive/Transmit-Data+
CNTR+
Control+ (Request to Send)
DGND (V-)
Data Ground
V+
(+5Vdc) Voltage+
No Connection
RxD/TxD-
Receive/Transmit-Data-
RP
Reserved for Module Power
6
Comments
Advertisement
Table of Contents
