INSTALLATION MTM5400 Mobile Terminal Installation Manual 63
25-Pin subD Connector
Data Expansion Head Enhanced:
Table 10 10-Pin TELCO Connector
Pin Function Description
1 Audio + Balanced Audio + (Bidirectional)
2 Not Connected
3 BUS+ This is used for communication between the radio and an Enhanced Control Head.
4 Audio- Balanced Audio - (Bidirectional)
5 Not Connected
6 Ground Ground
7 Radio On/Off Control This is the Enhanced Control Head service request input. A level of 5 volts
indicates that the Enhanced Control Head needs to communicate with the radio. In
addition it switches on the radio's voltage regulators. The idle state is a level below
0.6V.
8 SCI_TX This if for communication between the radio and the Enhanced Control Head.
9 FLT_A+ This voltage is at battery voltage level and is available as long as the radio is
connected to the supply voltage. The maximum current is 300mA. A fuse in the
radio prevents further circuit damage in case of shorting this pin to ground.
10 Analog Ground Analog Ground
Table 11 25-Pin subD Connector
Pin Function Description
1 GND Ground
2 RS232_SCI_TX Transceive data (RS232 line with RS232 level)
3 RS232_SCI_RX Receive data (RS232 line with RS232 level)
4 RS232_RTS Request to Send (RS232 line with RS232 level)
5 RS232_CTS Clear to Send (RS232 line with RS232 level)
6 FLT_A+ Filtered unswitched U
B
+ / 200mA
7 Signal_GND Ground for RS232
9 NC Not Connected
10 NC Not Connected
11 NC Not Connected
12 SW_B+ Switched U
B
+/100mA
13
To Next Page
Loading...
