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8014084/ZWT7/V3-1/2020-06 | SICK
O P E R A T I N G I N S T R U C T I O N S | TRANSIC111LP
Subject to change without notice
OPERATION
4
4.2.3
RS-485 interface
The TRANSIC111LP has a two-wire, serial RS-485 port without electric isolation. There are
also line termination resistors which can be switched on and off with a jumper.
Up to 32 measuring devices can be connected over a 1 km distance with a pair of twisted
wires. The system can request oxygen data from the addressed measuring devices.
Three separate operating modes exist:
1
POLL
: Standard operating mode
POLL mode for bus coupling:
Ensure that every device has a unique address:
a) To this purpose, the device must be opened with the
OPEN
command, the address
assigned and closed again with the
CLOSE
command.
b) The devices connected to the RS-485 bus can then be addressed individually.
c) Address the desired device by using the device address as a command parameter.
2
RUN
: Mode for continuous output of measured data. (The parameters to be output and
the output interval are adjustable). Command
S
stops RUN mode. The device switches to
STOP mode.
3
STOP
: No output of measured values.
4.2.4
Analog output
The TRANSIC111LP has a non-insulated current output. The configuration of the analog
outputs (0 or 4 ... 20 mA) and the switching behavior in error states are determined at order
time. These parameters can be changed via the maintenance interface.
4.2.5
Digital output relay
The contact relay can be configured at order time so that it signals limit value overflows or
underflows, maintenance requests or device errors. These settings can be changed via the
maintenance interface.
The RS-485 interface supports SICK's standard command set with additional, device-
specific commands.
The contact relay is momentary.
