User`s guide

T-MOPSlcdSA User's Guide

Serial-Communication Interfaces 19

9. Serial-Communication Interfaces

Two fully functional serial ports (COMA and COMB) provide asynchronous serial communications.

COMA and COMB support RS-232 operation modes and are compatible with the serial-port

implementation used on the IBM Serial Adapter. They are 15540 high-speed, UART-compatible and

support 16-byte FIFO buffers for transfer rates from 50 baud to 115.2K baud.

9.1 Connectors

COMA is available through the J3 connector (10 pins). COMB is available through the J5 connector

(10 pins). To find the location of this connector on the T-MOPSlcdSA board, please see the chapter

“Connector Locations”.

An adaptor cable is required to have the signals available on standard serial-interface connectors

DSUB9 or DSUB25. For adapter cable information see the section “Connector Functions and

Interface Cables”.

The following table shows the pin-outs for COMA and COMB, as well as connections for DSUB

adapters.

Header Pin Signal Name Function In / Out DSUB-25 DSUB-9

1 /DCD Data Carrier Detect In 8 1

2 /DSR Data Set Ready In 6 6

3 RxD Receive Data In 3 2

4 /RTS Request to Send Out 4 7

5 TxD Transmit Data Out 2 3

6 /CTS Clear to Send In 5 8

7 /DTR Data Terminal Ready Out 20 4

8 /RI Ring Indicator In 22 9

9 GND Signal Ground -- 7 5

10 VCC (*) +5V -- -- --

Notes:

(*) To protect the external power lines of peripheral devices, make sure that:

-- the wires have the right diameter to withstand the maximum available current

-- the enclosure of the peripheral device fulfils the fire-protecting requirements of IEC/EN

60950.

9.2 Configuration

You can set the two serial input/output interfaces to a variety of I/O addresses and IRQ

configurations. Settings are changeable from the T-MOPSlcdSA BIOS setup utility. Refer to the

“STPC Integrated IO Device Configuration Submenu” section in the “Appendix B: BIOS Operation”

chapter for configuration information.

Notes: Most operating systems detect the serial port with the I/O address 3F8h as COM1 and 2F8h as COM2.