Vaisala LT31 - Entering and Exiting Command Mode; Figure 91 Maintenance Line Connector on LTC212; Settings for Maintenance Terminal

User's Guide ______________________________________________________________________
134 _________________________________________________________________ M210667EN-C
RXD
TXD
GND
MOD1
MOD2
MOD3
MOD4
MOD5
20
21
22
23
24
25
26
27
Module
(modem)
(modem)
Maint.
line
RS-232
RS-485+
RS-485-
18
19
Data
line
CTS
RTS
RXD
TXD
GND
PC
RTS
2
D-9 pin
7
3
8
5
13
CTS
14
TXD
TXD
15
RXD
RXD
16
GND
GND
RS-232
Communication
line
17
Data
line
RS-232
VB+
VB-
RS-485+
RS-485-
9
10
11
12
Sensor
line
+12V Out
GND
5
6
7
8
1
2
3
4
Reset
Status
RXD
TXD
Reset Button
0401-120
Figure 91 Maintenance Line connector on LTC212
Settings for Maintenance Terminal
Select the VT100 emulation mode. Set the transmission rate of the
terminal to 9600 bps and the data frame to contain 8 data bits, 1 stop bit,
and no parity.
Entering and Exiting Command Mode
Before any commands can be given to LT31, the maintenance or data
line of LT31 has to be assigned to the operator. Otherwise, it is assigned
to automatic messages or polled communication.