Serial Communication - Z-World Fox LP3500 User Manual

3.4 Serial Communication

The LP3500 has three RS-232 serial ports that can set using the
call as one RS-232 serial channel (with RTS/CTS) and one 3-wire channel, or they may be
set as three RS-232 (3-wire) channels. Table 4 summarizes the options.
Table 4. RS-232 Serial Communication Configurations
serMode
0 RS-232, 3-wire
1 RS-232, 5-wire
The LP3500 also has one RS-485 serial channel (Serial Port F), one CMOS-level serial
interface port (Serial Port D), and one CMOS-level serial channel that serves as the pro-
gramming port (Serial Port A).
All six serial ports operate in an asynchronous mode. An asynchronous port can handle 7
or 8 data bits. A 9th bit address scheme, where an additional bit is sent to mark the first
byte of a message, is also supported. Serial Port D and Serial Port A, the programming
port, can be operated alternately in the clocked serial mode. In this mode, a clock line syn-
chronously clocks the data in or out. Either of the two communicating devices can supply
the clock. The LP3500 uses a 3.6864 MHz crystal, which is doubled to 7.3728 MHz. At
this frequency, the LP3500 supports standard asynchronous baud rates up to a maximum
of 921,600 bps.
Table 5 lists the use and the capabilities of the six serial ports.
Table 5. LP3500 Serial Port Uses and Capabilities
Serial Port
A
B
C
D
E
F
User's Manual
B
RS-232, 3-wire
CTS/RTS
Use
Programming port or logic-level
serial port
3-wire RS-232
3-wire RS-232 or RTS/CTS flow
control for Serial Port B
General-purpose serial interface
port
RS-232
RS-485
serMode
Serial Port
C
RS-232, 3-wire
RS-232, 3-wire
Header
Location
J5
J4
J4
J6
J4
J4
software function
E
Synchronous
Capability
Yes
No
No
Yes
No
No
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