TANGO55/i & TANGO56/i User's Manual
Version 1.05
4.1.2 Interface B (9-pin D-SUB connector)
Interface B has the highest priority connection to control the TANGO55/56 modem.s
This one has a standard D-SUB-male serial connector.
RS232
9 pin D-Sub to DIN 41652
+/-12V
RX, TX, RTS, CTS, DTR, DSR, DCD, RI
300...115200
Baud rates for serial link (2400...19200 with auto-bauding)
Interface B (DB9 connector) has the following layout.
Figure 3:
RS232 pin-out (interface B)
Pin
Description
Direction
1
DCD ↔ Data Carrier Detect
OUT
2
RxD ↔ Received Data
OUT
3
TxD ↔ Transmitted Data
IN
4
DTR ↔ Data Terminal Ready
IN
5
GND ↔ Signal Ground
-
6
DSR ↔ Data Set Ready
OUT
7
RTS ↔ Request To Send
IN
8
CTS ↔ Clear To Send
OUT
9
RI ↔ Ring Indicator
OUT
Table 10:
Pin assignment of the standard RS232 connector
4.1.3 Interface C (8-pin RJ45 connector)
The TANGO55/56 modems provide this interface (RJ45) for serial and audio
connection.
You can use a RJ45 serial cable to connect the modem’s RJ45 connector (Interface
C) to external controller/computer (without HW handshake). If TANGO55/56
modems have been connected through interface B, interface C is automatically
deactivated (Rx, Tx). In this case, only 4 pins are available (MIC[+,-] and SPK[+,-]). So
a headset can be connected (see Appendix chapter
7.3
headset’s characteristic).
This interface supports also a connection to an external device such as active
headset.
Figure 4:
Audio interface pin-out (interface C)
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