USING THE UNIVERSAL DEVELOPER'S KIT
73
LZT 123 8020 R1A
Hence the module determines the state of the signal at the
System Connector Header. Refer to the appropriate Integrator's
Manual for a description of the signals.
12.3 Serial interface
The external host communicates with the module/radio device
through J501, which is a standard RS-232 9-pin interface (see
below). The straight-through serial cable provided connects
from J501 (DB-9 Female) to the serial port of a PC (DB-9 or
DB-25 Female).
Pin RS-232
Description
1
DCD
Data Carrier Detect
2 TXD
Transmission
Data
3
RXD
Receiver Data
4 DTR
Data
Terminal
Ready
5
GND
Ground
6
DSR
Data Set Ready
7
RTS
Request to Send
8
CTS
Clear to Send
9
RI
Ring Indicator
Table 7: RS-232 DB9 Pin-out
The primary connector, J501, routes all the signals to the
module interface, while level shifting the appropriate ones. The
secondary connector, J502, does not route all of the signals to
the module. The following table details the signal routing from
J502.
Pin RS-232 Routing
1
DCD
Not Connected
2
TXD
to X502, Routes to CFMS (System Connector Pin 39) or TD3
3
RXD
to X501, Routes to CTMS (System Connector Pin 37) or RD3
4 DTR
Not
Connected
5
GND
Ground
6 DSR
Not
Connected
7
RTS
to J502 Pin 8 (CTS) through a 0 Ohm Resistor (R535)
8 CTS
to J502 Pin 7 (RTS) through a 0 Ohm Resistor (R535) and
N502 Pin 17 through a 0 Ohm Resistor (R536)
9
RI
Not Connected
Table 8: RS-232 DB9 J502 Routing
Hardware Flow Control Mechanism is provided via the signals
CTS, DTR and RTS. Flow control is used for CSD applications.
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