DZ27001a_e.doc / Jan-13
Page 11 / 36
3.5. Serial Interface
The serial RS232 interface in general may be used
for easy setup and commissioning of the units (with use of the OS32 operator software)
to change settings and parameters by PC or PLC during the operation
to read out internal states and actual measuring values by PC or PLC
The subsequent drawing shows how to link the monitor with a PC, using the standard
9-pin Sub-D-9 connector
2
3
5
RxD
RxD
TxD
TxD
GND
Screen
PC
DZ 270
DZ 271
DZ 276
DZ 277
DZ 279
15
(Sub-D-9)
16
14
3.6. Relay Outputs K1 – K3 (DZ270 and DZ 277 only)
The units provide three programmable relay outputs (all dry changeover), providing a switching
capability of 30 volts / 2 amps DC or 125 volts / 0.6 amps AC or 230 volts / 0.3 amps AC. Both,
switching characteristics and monitoring function may be programmed for each of the relays
individually.
3.7. Tansistor Outputs K1 – K3 (DZ271 and DZ 279 only)
The units provide three outputs with programmable switching characteristics.
K1 – K3 are fast-switching and short-circuit-proof transistor outputs with a switching capability
of 5 – 30 volts / 350 mA each. The switching voltage of the outputs must be applied remotely
to the Com+ input (terminal 22). Both, switching characteristics and monitoring function may be
programmed for each of the outputs individually.
3.8. Scalable Analogue Output (DZ270, DZ271 and DZ 276 only)
The units provide a voltage output with a +/-10 volts range (max. load 2 mA) and a current
output with ranges 0 – 20 mA respectively 4 – 20 mA (load 0 – 270
Ω
). Beginning and end of
the desired conversion range can be set by the operator menu. The common potential of both
outputs refers to GND.
The total resolution is 14 bits. A settling time of approx. 200µs. is required. The overall
response time of the analogue outputs primarily depends on the selected Sampling Time
setting. After volatile jumps of the input signal, the analogue outputs may need up to two
Sampling Time cycles (plus 200 µsec.) to stabilize.
