OTT CBS, Руководство по эксплуатации, Страница: 19 / 28

8 Setting operating parameters using DIP switches
The eight DIP switches are behind a cover on the underside of the OTT CBS
(see Figure 1). The following operating parameters can be set with them:
䊳
DIP 1, 2, 3 Setting the type of SDI-12 interface
䊳
DIP 4 Setting measurement type as level or depth measurement *
䊳
DIP 5 + 6 Scaling measuring range *
䊳
DIP 7 Setting metric or imperial system (m/mbar or feet/psi) *
䊳
DIP 8 Setting measurement type as water level or pressure measure-
ment *
* these settings only affect the 4 … 20 mA interface.
8.1 Setting the type of SDI-12 interface
With DIP 1 … 3 select the type of SDI-12 interface of the OTT CBS (screw terminal
strip B; contacts 1 to 4). Please also take note that only one of the interfaces can
be used in each case: 4 … 20 mA or SDI-12 (no parallel operation of the inter-
faces).
Possible types for the SDI-12 interface
䊳
Standard SDI-12 interface (protocol and physical interface: SDI-12)
䊳
SDI-12 via RS-485 interface
without
termination (SDI-12 protocol via
physical RS-485 interface).
Use this setting if multiple OTT CBS are connected in parallel to one RS-485
cable (bus operation) for all OTT CBS except the last device at the end of the
bus.
䊳
SDI-12 via RS-485 interface
with
termination (SDI-12 protocol via physical
RS-485 interface).
Use this setting if
– multiple OTT CBS are connected in parallel to the RS-485 cable (bus
operation) for the last device at the end of the bus, or if
– only one OTT CBS is connected to the RS-485 cable.
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
ON
1 2 3 4 5 6 7 8
SDI-12 i n ter f ace
SDI-12 via RS-485 i n ter f ace
without
ter m i n atio n
SDI-12 via RS-485 i n ter f ace
with
ter m i n atio n
Fig. 15: Setting the type of SDI-12
interface of the OTT CBS.
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