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Hardware ports, switches and LEDs
Deutschmann Automation GmbH & Co. KG
38
UNIGATE fieldbus gateway for ProfibusDP V. 4.7
29.4.11
11.6.2
Slide switch Termination Profibus
If the gateway is operated as the first or last physical device in the ProfibusDP, there must be a
bus termination at this gateway. In order to do this, either a bus terminating resistor must be acti-
vated in the connector or the resistor (220
) integrated in the gateway must be activated. In
order to do this, slide the slide switch to position ON. In all other cases, the slide switch must
remain in position OFF. Please refer to the general Profibus literature for further information on
the subject of bus termination.
11.6.3
Rotary coding switches S4 + S5 (RS485 ID)
These two switches are used to set the RS485 ID of the gateway in hexadecimal notation pro-
vided an ID is required for the bus. Please refer to the Annex for a conversion table from decimal
to hexadecimal. This value is read in only once when the gateway is activated.
11.6.4
Slide switch (RS485/RS232 interface)
This slide switch is used to select whether an RS485 interface or an RS232 interface is con-
nected at the connector to the external device.
11.6.5
Slide switch (RS485/RS422 termination)
If the gateway is operated as the first or last physical device in the RS485 bus, there must be a
bus termination at this gateway. In order to do this, either a bus terminating resistor in the con-
nector or the resistor (150
) integrated in the gateway must be activated. In order to do this,
slide the slide switch to position ON. In all other cases, the slide switch must remain in position
OFF. Please refer to the general RS485 literature for further information on the subject of bus ter-
minations.
If the integrated resistor is used, please allow for the fact that this also activates a pull-down
resistor (390
) to ground and a pull-up resistor (390
) to VCC.
At the RS422-interface the transmission line is terminated. The receive line is always firmly
terminated.
11.7 Special features of the Debug version
Only the UNIGATE SC 232/485 is available as Debug version. This gateway features a 9-pole
D-SUB plug.
11.8 The Debug cable for UNIGATE SC
As accessory a configured Debug cable is available. The Debug cable consists of a 9-pin D-SUB
socket (basis board RS-side) with two exits:
•
a 9-pin D-SUB socket for the connection to Debug COM-PC
•
a 5-pin D-SUB Phoenix 2 adapter cables,
one with a 9-pin D-SUB socket for the connection to COM-PC (RS232) and one with open
cable ending for the connection to the customer’s application (RS232/485).
Содержание UNIGATE RS232/422
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