11
2.2
Connectors
All connectors are directly mounted on the modem board. The connector name, type of
connectors and their functions are as follows:
Connector
Type
Function
X1
64-pin Euro
power supply
X2
9-pin D-connector
RS 232 serial interface
Xn.1
RJ12
public telephone network
Xn.2
9-pin D-connector
RS 232 serial interface
Xn.3
10-pin
leased line / radio
n is the card slot number for the modem board.
Connectors X2 and Xn.3 are connected in parallel. For a description of the pin configura-
tion of each connector, refer to chapter ‘Technical Specifications’.
LED indicators
LIN
Modem connected to line (off hook), connected to the line relay control signals
RNG Indicates a true ringingsignal, connected to the micro controller
TXD Tranmitted data, connected to modem's TxD-signal
RDX Received data, connected to modem's RxD-signal
CD
Carrier detect, connected to the micro controller
RTS Ready To Send, connected to the micro controller
IRF
Internal Fault detected by the watchdog. Led is normally off.
Xn.1, RJ-12 Telephone line
Xn.2, RS-232 connector
Xn.3, radio and leased line connector
1 TX_LINEA, 2-wire connection and 4-wire transmit.
2 TX_LINEB, 2-wire connection and 4-wire transmit.
3 RX_LINEA, 4-wire receive data.
4 RX_LINEB, 4-wire receive data.
5 Not connected
6 RADIO_ONA, Radio ON relay, normally open contact.
7 RADIO_ONC, Radio ON relay, common.
8 RADIO_ONB, Radio ON relay, normally closed contact.
9 SCUELCH STATEA, Radio subscriber detect (+).
10 SCUELCH STATEB, Radio subscriber detect (–).
Pin
Signal
V.24
I/O
Description
1
DCD
109
O
Data Carrier Detect
2
RxD
104
O
Received data
3
TxD
103
I
Transmitted data
4
DTR
108/2
I
Data Terminal Ready
5
GND
102
-
Signal ground
6
DSR
107
O
Data Set Ready
7
RTS
105
I
Request TO Send
8
CTS
106
O
Clear TO Send
9
RI
125
O
Ring Indicate
Fig. 2. Connection view
As the cables to be used for connecting the modem to the telephone network, leased lines
and radio system depend on local conditions, these are not provided. For connecting a PC
to the modem, use a standard RS232.
