Serial Interface; Figure 3-1. Rs-485 Serial Port Implementation - ADLINK Technology CoreModule 430 Reference Manual

Chapter 3

Serial Interface

The Vortex CPU contains the circuitry for all four serial ports. The CoreModule 430 provides serial ports 1
and 2 through transceivers U7 and U9 (headers J3 and J9), serial port 3 through transceiver U4 (header J14)
and serial port 4 through transceiver U5 (header J13). The serial ports support the following features:
•
Programmable word length, stop bits and parity
•
16-bit programmable baud rate generator
•
Interrupt generator
•
Loop-back mode
•
16-bit FIFOs for each port
•
Ports 1, 2, 3, and 4 are supported by the Vortex processor and are 16C550/16C552 compatible
Serial 1 (J3, COM1) supports RS-232/RS-485 with full modem operation

Serial 2 (J9, COM2) supports RS-232/RS-485 with full modem operation

Serial 3 (J14, COM3) supports RS-232 with full modem operation

Serial 4 (J13, COM4) supports RS-232 with full modem operation

NOTE The RS-232/RS-485 mode for Serial Port 1 (COM1) and Serial Port 2 (COM2)
are selected in BIOS Setup Utility. However, the RS-232 mode is the default
(Standard) for any serial port.
RS-485 mode termination is selected with jumper JP2 Serial 1 (COM1) and JP1
Serial 2 (COM2) on the module. Refer to
To implement the two-wire RS-485 mode on either serial port, you must tie the equivalent pins together for
the selected port.
For example, you must tie pin 3 (Rx Data –) to 5 (Tx Data –) and pin 4 (Tx Data +) to 6 (Rx Data +) at Serial
Port 1 or 2 (J3 or J9) for the two-wire interface. As an alternate, you may short the equivalent pins on the
DB9 connector attached to respective serial port, as shown in
for the specific pins on the connectors. The RS-422 mode uses a four-wire interface and does not require
combining pins for its operation, but you must select RS-485 in BIOS Setup.
Serial Ports (J3, J9)
(COM1 or COM2)
Side View
Table 3-6 provides the signals for the corresponding pins of the two independent serial interfaces (Serial 1 &
2), and Table 3-7 provides the signals for the corresponding pins of two independent serial interfaces (Serial
3 & 4). Both interfaces use 10-pin, right-angle headers with 2 rows, odd/even sequence (1, 2), and 0.100"
(2.54mm) pitch.
CoreModule 430
9 5 3 1
7
Standard DB9 Serial
Or
Port Connector (Female)
10 8 6 4 2

Figure 3-1. RS-485 Serial Port Implementation

Reference Manual
Table 2-3 for more information.
Figure 3-1. Refer also to the following tables
1 2
Rear View
6
Hardware
4 5
3
7 8
9
21