21
Unit Components
Section 2-1
Peripheral setting
For the physical layer settings on the RS-422A / RS-485 network port, two
switches are provided on the front-case of the Unit, located close to the RS-
422A / RS-485 network connector.
Switch 1 defines whether to use RS-422A or RS-485 as the physical layer on
the RS-422A / RS-485 network.
Switch 2 enables or disables the termination resistor on the RS-422A / RS-
485 receiver channel.
The two switches are independent of the selected protocol. They can be
changed during operation and take effect immediately.
Note
1.
It is recommended to switch the power off before changing switches.
2.
If the wrong combination is selected for this PRT1-SCU11 (e.g. Host Link
and RS-485 or Compoway-F and RS-422A), the communication between
the PRT1-SCU11 and the connected devices may not work. The Unit has
no direct way of detecting this, apart from a possible time-out.
2-1-4
PROFIBUS Connector
The PROFIBUS connector on the font of the Unit is a 9-pin female sub-D con-
nector, as recommended by the PROFIBUS standard EN50170.
The signal RTS (TTL signal) is for the direction control of repeaters, which do
not have a self-controlling capability.
Switch 1
Description
OFF
RS-422A
ON
RS-485
Switch 2
Description
OFF
220 Ohm Termination resistor disabled.
ON
220 Ohm Termination resistor enabled.
PERIPHERAL
NODE
24 Vdc
ON
1
2
R
Termination switch
RS-422A / RS485 switch
ADDRESS
Pin No.
Signal
Description
1
Shield
Shield/protective ground
2
--
3
B-line
Receive/Transmit data - plus (B wire)
4
RTS
Control signal for repeaters (direction control) (TTL)
5
DGND
Data ground (reference potential for VP)
6
VP
Supply voltage of the terminator resistance (5 Vdc)
7
--
8
A-line
Receive/Transmit data - minus (A wire)
9
-
-
5
9
1
6
Summary of Contents for PROFIBUS DP GATEWAY
Page 1: ...OPERATION MANUAL PROFIBUS DP Gateway to Host Link Compoway F PRT1 SCU11 Cat No W01E EN 02 ...
Page 2: ...PRT1 SCU11 PROFIBUS DP Gateway Operation Manual Revised September 19 2005 ...
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