insys icom i-modul 144/56k, Руководство дизайнера, Страница: 9 / 63

i-modul Modem 144/56k Connections
2.2 Pin Layout Terminal Strip P1
Pin Type Signal Description
1 GND Ground of supply voltage (ground)
2 Supply VCC 5 V DC supply voltage (or 3,3 V)
3 GND Ground of supply voltage (ground)
4 Input TXD Terminal transmit signal of RS232 line; TTL level
5 GND Ground of supply voltage (ground)
6 Output RXD Receive signal of 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
=
0 . 1
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 Internal connection, do not use
18 Internal connection, do not use
19 Internal connection, do not use
20 Internal connection, do not use
21 GND Ground
22 Internal connection, do not use
23 Internal connection, do not use
24 GND Ground
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 Outgoing phone line (exchange line or PABX)
2 Phone signal b2 Telephone connected in series
3 Phone signal a1 Incoming phone line (exchange line or PABX)
4 Phone signal a2 Telephone connected in series
5 External bell W Not connected
6 Earth E Not connected
Table 5: Terminal strip connections description, terminal strip P2
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