Control port connection, Connecting to a modem, Rs-232 (control port) interface schematic – Western Telematic Remote Power Boot Switch User Manual

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allows the user to invoke On/Off/Boot commands, but prevents redefinition of parameters
such as the Password and Power-Up Default.

Switch Function

Up

Down

1

Control Port Baud
Rate

2400 bps 9600 bps*

2

Off Time

10 sec.

5 sec.*

3

Password Function

Disable

Enable*

4

Read Only Mode

Enable

Disable*

* = Factory Setting

3.2. Control Port Connection

The male, DB9 connector (labeled "RS232") is used for connection to an external modem or
local PC. The RS232 Port uses a DTE configuration, similar to an AT computer.

Figure 3

describes the Control Port interface.

Figure 3: RS-232 (Control Port) Interface Schematic

3.2.1. Connecting to a Modem

When connecting directly to an external modem, use a standard AT to Modem cable. Make
certain the modem is initialized at the same baud rate as the RPB+ (SetUp Switch 1). The
modem must be placed in Auto-Answer mode, and set to answer in one ring. Please refer to
the user's guide for your external modem in order to determine the appropriate AT command

RPB+; Remote Power Boot Switch -- User's Guide

file:///C|/WEBPAGE/guides/rpbp/build/rpbpguid.htm (5 of 12) [3/9/2000 5:08:10 PM]

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