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i-modul Modem 336 LL
Connections
2.2
Pin Layout Terminal Strip P1
Pin Type
Signal
Description
1
GND
Ground of supply voltage (ground)
2
Supply
VCC
5V DC supply voltage
3
GND
Ground of supply voltage (ground)
4
Input
TXD
Transmit signal from the terminal of the RS232 line; TTL level
5
GND
Ground of supply voltage (ground)
6
Output
RXD
Receive signal from the RS232 line; TTL level
7
Output
ID-PIN2
Ground
8
Input
RTS~
Request to Send; TTL level (RS232 signal)
9 Output
ID-PIN1 GND
10
Output
CTS~
Clear To Send; TTL level (RS232 signal)
11
Input
RESET~
RESET, TTL level, t
min
= 3 s
12
Input
DTR~
Data Terminal Ready; TTL level (RS232 signal)
13 Output
OH~
Off
Hook
14
Output
DCD~
Data Carrier Detect; TTL level (RS232 signal)
15
Output
RI~
Ring Signal TTL level (RS232 signal)
16
Output
DSR~
Data Set Ready; TTL level (RS232 signal)
17
Output
UA
Switch output; TTL level
18
Input
UE
Alarm input; TTL level
19
Output
UA2
Switch output 2; TTL level
20
Input
UE2
Alarm input 2; TTL level
21
Not
connected
22
Not
connected
23
Not
connected
24
Not
connected
Table 4: Terminal strip connections description, terminal strip P1
The tilde "~" behind the signal description indicates that this signal is "low
active".
2.3
Pin Layout Terminal Strip P2
Pin
Signal
Description
1
Phone signal
b1
Leased line for 2-wire operation
Transmit line for 4-wire operation
2
Phone signal
b2
Receive line for 4-wire operation
3
Phone signal
a1
Leased line for 2-wire operation
Transmit line for 4-wire operation
4
Phone signal
a2
Receive line for 4-wire operation
Table 5: Terminal strip connections description, terminal strip P2
9