A - 8 CONNECTOR PIN FUNCTIONS
Pin Function Description PC direction
1 DCD Data Carrier Detect Input
2 RXD Received Data Serial IN
3 TXD Transmitted Data Serial OUT
4 DTR Data Terminal Ready Output
5 Ground Ground
6 DSR Data Set Ready Input
7 RTS Request to Send Output
8 CTS Clear to Send Input
9 RI Ring Indicator Input
Table A-7 Pin Assignment of 9 Pin subD Connector of the Data Expansion Head Enhanced
Pin Function Description
1 GND Ground
2 RS232_SCI_TX Transmit Data (4-wire RS232 with RS232 level)
3 RS232_SCI_RX Receive Data (4-wire RS232 with RS232 level)
4 RS232_RTS Request to Send (4-wire RS232 with RS232 level)
5 RS232_CTS Clear to Send (4-wire RS232 with RS232 level)
6 FLT_A+ This voltage is at battery voltage level and is available as long as the
radio is connected to the supply voltage. A fuse in the radio prevents
further circuit damage in case of shorting this pin to ground. This pin is
only used together with the pins 14, 20, and 23 to select flashing and
programming mode, or to switch the radio on.
7 Ground Ground for RS232
8 SB9600_BUSY SB9600 Busy
9 NC Not Connected
10 NC Not Connected
11 NC Not Connected
12 SW_B+ Switched U
B
+/100mA
13 SB9600_BUS- SB9600 BUS-
14 FLASH_MODE This input is intended to switch the radio into flashing & programming
mode. When the radio is switched off and this pin is connected with pin
6 (FLT A+), the radio switches on and enters flashing & programming
mode.
15 SB9600_BUS+ SB9600 BUS+.
Table A-8 Pin Assignment of the 25 Pin subD Connector of the Data Expansion Head Enhanced
6866539D31.book Page 8 Tuesday, March 20, 2007 6:32 PM
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