20
Unit Components
Section 2-1
part of the DIP-switch bank of 4. Two out of the four DIP-switches are used to
select the baud rate to be used for communication over the Host Link/Compo-
way-F interface. All the possible combinations are summarized in the next
table.
The two DIP-switches for the baud rate are only read during power-up/restart
of the PROFIBUS-DP Gateway Unit. Changing them during operation has no
effect.
Auxiliary Port Selection
Switch 4 allows the user to enable or disable the use of the RS-232C Port,
behind the cover next to the DIP-switches.
Switch 4 can be changed during operation. The selected mode is reflected
through the LED Indicators.
Pheripheral setting
Two switches determine the setting for the physical layer, these two switches
are located close to the connector for Host Link / Compoway-F communica-
tion.
• Switch 1(upper switch): Select physical interface: OFF is RS-422 or ON is
RS-485.
• Switch 2(lower switch): Enable (ON) or Disable (OFF) termination resistor
on the RS-422/RS-485 Receiver lines.
The two switches are independent of the selected protocol. They can be
changed during operation and take effect immediately (it is recommended to
switch the power off before changing switches). This means however, that if
the wrong combination is selected for this Gateway(i.e. Host Link and RS-485
or Compoway-F and RS-422), the communication between the PROFIBUS-
DP Gateway Unit and the connected devices may not work. The Unit has no
direct way of detecting this, apart from a possible time-out.
Switch 1
Switch 2
Baud rate (bits/sec.)
OFF
OFF
9600 (default)
OFF
ON
19200
ON
OFF
38400
ON
ON
Reserved for future
use
PRT1-SCU11
ON
RUN
ERR
COMM
BF
FCOM
x
10
x
1
0
2
3
4
5
6
7
8
9
1
0
2
3
4
5
1
1
2
3
4
DIP switches
Switch 4
Description
OFF
PROFIBUS to Compoway-F and Host Link is active. The RS-
232C Auxiliary Port is inactive.
Communication from PROFIBUS is rerouted to the RS-485/RS-
422 communication port.
ON
PROFIBUS to Compoway-F and Host Link is inactive. The RS-
232C Auxiliary Port is active.
Communication from the Auxiliary Port is rerouted to the RS-485/
RS-422 communication port.
PERIPHERAL
NODE
24 Vdc
ON
1
2
R
Termination switch
RS-422A / RS485 switch
ADDRESS