Vaisala LT31 - Figure 117 LTC212; Figure 39 Modem Wiring

User's Guide ______________________________________________________________________
82 __________________________________________________________________ M210667EN-C
Modem
connection
Modem
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
13
14
15
16
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
MILOS 500 or other
host computer
0401-070
Figure 39 Modem Wiring
If the DMX501 modem is not installed, it can also be retrofitted to the
LTC212 unit. This is shown in Figure 40 on page 83.