Robotics Sportster Flash x2 Guía de usuario descargar pdf (Pagina 65)

User’s Guide & Reference 61

The Serial Interface

The serial interface is a standard developed by the Electronic

Industries Association (EIA). It defines the signals and voltages

used when data is exchanged between a computer and a modem or

serial printer.

The entire standard covers many more functions than are used in

most data communications applications. Data is transmitted

between the devices over a shielded serial cable with a 25-pin male

(DB-25P) connector to the modem and a 25-pin, 9-pin, 8-pin, or

custom-built connector to the computer.

FCC regulations require the use of a shielded cable when

connecting a modem to a computer to ensure minimal interference

with radio and television.

Pin assignments are factory-set in the Sportster modem to match

the standard DB-25 assignments in the following table. DB-9

connectors for IBM/AT-compatible computers should be wired at the

computer end of the cable as shown in the DB-9 column.

Serial Interface Pin Definitions

Signal Source

DB-25DB-9 Circuit Function

Computer/Modem

1 — AA Chassis Ground Both

2 3 BA Transmitted Data Computer

3 2 BB Received Data Modem

4 7 CA Request to Send Computer

5 8 CB Clear to Send Modem

6 6 CC Data Set Ready Modem

7 5 AB Signal Ground Both

8 1 CF Carrier Detect Modem

12 — SCF Speed Indicate Modem

20 4 CD Data Terminal Ready Computer

22 9 CE Ring Indicate Modem

1 2 ... 60 61 62 63 64 65 66 67 68 69 70

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Robotics Sportster Flash x2 Guía de usuario Pagina 65