Vaisala PTB210 SERIES Guía de usuario Pagina 13

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Chapter 3 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 11
Connections
There are three different serial output interfaces available with the
PTB210 digital barometers: RS232C, RS485/232C, and
RS232C/TTL. The connections depend on the output protocol in use.
In following tables there are presented the connections of these output
interfaces.
RS232C
Table 1 Connections of the PTB210 Barometer with RS232C
Interface.
Wire color Si
g
nal
Gre
y
RX
Green TX
Blue Groun
Pin
k
Su
pp
l
y
volta
g
e
(
5 ... 28 VDC
)
Brown not connecte
d
White not connecte
d
Yellow External power control
(
TTL level: 1 = 5 V= off
,
0 = 0 V= on
)
It is recommended to isolate the free wire ends.
RS485
Table 2 Connections of the PTB210 Barometer with
RS485/RS232C Interface
Wire color Si
g
nal
Gre
y
RX
(
with RS232C
)
Green TX
(
with RS232C
)
Blue Groun
Pin
k
Su
pp
l
y
volta
g
e
(
8 ... 18 VDC
)
Brown RS485 -
White RS485 +
Yellow External power control
(
TTL level: 1 = off
,
0 = on
)
See also chapter "Setting the RS485 Terminating Resistor On/Off "on
page 19.
NOTE
The two output protocols cannot be used simultaneously. Connect
either RX/TX or RS485 wires. It is recommended to isolate the free
wire ends.
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