Integrator's Manual GR47/GR48

5. SYSTEM CONNECTOR INTERFACE
36
LZT 123 7589 R1A
5.9 Serial Data Interfaces
The serial channels, consisting of three UARTs, are asynchronous
communication links to the application or accessory units.
• UART1 has RS-232 functionality and is used for all on- and off -line
communication.
• UART2 behaves as a general-purpose serial data link. For example, it
can be used for GPS, downloading software and receiving logging
information.
• UART3 behaves as a general-purpose serial data link. It can be used by
an embedded application.
Typical Rise/Fall times Rise Time Fall Time Unit
PCMCLK 19 18 ns
PCMSYN 19 15 ns
PCMOUT 900 900 ns
PCMDLD 20 19 ns
Pin Signal Dir Description RS232
CCITT Nº
41 TD I Serial data to radio device (UART1) 103
42 RD O Serial data from radio device (UART1) 104
39 RTS
IO9
I
I/O
Request To Send (UART1)
General purpose input/output 9
105
40 CTS
KeyCOL4
O4
O
O
O
Clear To Send (UART1)
Key column 4
General purpose output 4
106
37 DTR
KeyROW1
IN1
I
I
Data Terminal Ready (UART1)
Keyboard row 1
General purpose input 1
108.2
32 DSR
KeyCOL3
O3
O
O
O
Data Set Ready (UART)
Key column 3
General purpose output 3
107
38 DCD
KeyCOL 1
O1
O
O
O
Data Carrier Detect (UART1)
Key column 1
General purpose output 1
109
36 RI
KeyCOL 2
O2
O
O
O
Ring Indicator (UART1)
Key Column 2
General output 2
125
45 TD2 I Transmitted Data (UART2)
46 RD2 O Received Data (UART2)
43 TD3 I Transmitted Data (UART3)
44 RD3 O Received Data (UART3)