Vaisala DMT346 - Manual (Page 77)

Chapter 4 _________________________________________________________________ Operation
VAISALA ________________________________________________________________________ 77
User Port Connection
Use suitable serial cable between the user port RxD, GND and TxD
screw terminals and the PC serial port.
Table 14 Default Serial Communication Settings for User Port
Parameter Value
Bauds 4800
Parity Even
Data bits 7
Stop bits 1
Flow control None
0506-033
Figure 49 Connection Example between PC Serial Port and User
Port
Connections to pins 4,6,7 and 8 are required only if your software
requires hardware handshaking.
NOTE User port cannot be used when the RS-485 module is connected.
User Port Operating Modes
When the transmitter is powered up, it will behave according to its
configured operating mode:
- In STOP mode, the transmitter outputs the software version and the
command prompt (if echo is on).
- In RUN mode a measurement output starts immediately.
- In POLL or MODBUS mode, the transmitter does not output anything
after power-up.
For a description of the modes, see section SMODE on page 112.
NOTE RS-232 User Port cannot be used when a communication module
(LAN, WLAN, or RS-422/485 interface) has been installed.
1 2 3 4 5
6 7 8 9
+
–
RxD
GND
TxD
Ch1+
Ch1–
Ch2+
Ch2–
ANAL
OG
O
UT
PUT
S
US
ER P
ORT
POWE
R
RS
-232
10…
36 V
=
24 V
~
IOIOI