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Chapter 3 Hardware

MiniModule SIO Reference Manual 17

Serial Interfaces

The LPC Super I/O chip (SCH3114I-NU) provides the circuitry for four serial ports through four

transceivers. Transceivers U8 and U12 provide RS-232 signals, and transceivers U10 and U14 provide

RS-485/422 signals. The J7 and J9 headers each consist of 10 vertical pins, 2 rows, odd/even (1, 2) pin

sequence, and 0.079" (2.0mm) pitch. The J10 and J11 headers each consist of 10 right-angle pins, 2 rows,

odd/even (1, 2) pin sequence, and 0.079" (2.0mm) pitch. The two DB9 connectors, J6 and J8, are standard

serial connectors, and those pinouts are not included in this manual. The J7 and J9 headers serve as internal

alternatives to the DB9 connectors (COM1 and COM2). The four serial ports support the following features:

• Programmable word length, stop bits and parity

• 16-bit programmable baud rate generator

• Interrupt generator

• Loop-back mode

• Four individual 16-bit FIFOs

• Serial Interfaces:

♦

Serial COM1 (J7) supports RS-232/RS-485/422 with full modem operation

♦

Serial COM2 (J9) supports RS-232/RS-485/422 with full modem operation

♦

Serial COM3 (J10) supports RS-232/RS-485/422 with full modem operation

♦

Serial COM4 (J11) supports RS-232/RS-485/422 with full modem operation

To implement the two-wire RS-485 mode on any of the 10-pin serial headers, you must tie pin 3 (Rx Data –)

to 5 (Tx Data –) and pin 4 (Tx Data +) to 6 (Rx Data +) as shown in Figure 3-1. As an alternate, you may

short the equivalent pins on the DB9 connectors attached to respective serial ports, as shown in Figure 3-1.

Refer also to Table 3-2 for the specific pin signals on each of the headers. 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.

Figure 3-1. RS-485 Serial Port Implementation

Table 3-2 lists the pin signals for each of the serial headers (J7, J9, J10, and J11.) Refer to previous bullets in

this section for port number identification.

NOTE The RS-485/422 mode for any serial port is selected in the BIOS Setup Utility.

However, the RS-232 mode is the default for any serial port.

RS-485/422 mode termination is selected with jumper JP2 for COM2, JP3 for

COM1, JP4 for COM4, and JP5 for COM3. Refer to Table 2-3 for more

information.

MMSIO_RS485jump_a

6810

Serial Headers

J7, J9, J10, and J11

(COM1, COM2, COM3,

and COM4)

Standard DB9 Serial

Port Connectors

(COM1 and COM2)

Male Front View

1 2 ... 16 17 18 19 20 21 22 23 24 25 26 ... 29 30

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