Motorola MTM800 User Manual page 222

A - 8
Pin Function
1 DCD
2 RXD
3 TXD
4 DTR
5 Ground
6 DSR
7 RTS
8 CTS
9 RI
Table A-7 Pin Assignment of 9 Pin subD Connector of the Data Expansion Head Enhanced
Pin Function
1 GND
2 RS232_SCI_TX
3 RS232_SCI_RX
4 RS232_RTS
5 RS232_CTS
6 FLT_A+
7 Ground
8 SB9600_BUSY
9 NC
10 NC
11 NC
12 SW_B+
13 SB9600_BUS-
14 FLASH_MODE
15 SB9600_BUS+
Table A-8 Pin Assignment of the 25 Pin subD Connector of the Data Expansion Head Enhanced
Description
Data Carrier Detect
Received Data
Transmitted Data
Data Terminal Ready
Ground
Data Set Ready
Request to Send
Clear to Send
Ring Indicator
Description
Ground
Transmit Data (4-wire RS232 with RS232 level)
Receive Data (4-wire RS232 with RS232 level)
Request to Send (4-wire RS232 with RS232 level)
Clear to Send (4-wire RS232 with RS232 level)
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.
Ground for RS232
SB9600 Busy
Not Connected
Not Connected
Not Connected
Switched U +/100mA
B
SB9600 BUS-
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.
SB9600 BUS+.
CONNECTOR PIN FUNCTIONS
PC direction
Input
Serial IN
Serial OUT
Output
Input
Output
Input
Input