B&B Electronics 232MSS2 manual Port Configuration, DCE Master Port Chart C & D Ports

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Port Configuration

In order to determine the proper port configuration of the 232MSS2, it is necessary to have a basic understanding of the terms DCE and DTE. RS-232 was designed, using DB-25 connectors, for connecting a DTE (Data Terminal Equipment) device to a DCE (Data Communication Equipment) device. Each device will have inputs on pins that correspond to outputs on the same pins of the other device. For example, a DTE device will transmit data out on pin 2 (on a DB-25) and a DCE device will receive data in on pin 2 (on a DB-25). IBM PCs and serial printers are DTE devices, modems are DCE devices.

If an IBM PC (DTE device) is going to be connected to the 232MSS2 master port, the master port should be configured as a DCE port. If a modem (DCE device) is going to be connected to the master port, it should be configured as a DTE port.

The master port can be configured as a DCE port (data received on pin 2) or a DTE port (data received on pin 3) by setting dipswitch “SW1”, position 8. To configure the master port as a DCE port, move dipswitch “SW1”, position 8, to the "OFF" position. When the master port is configured as a DCE port, ports A, B, C, & D will become DTE ports (Refer to Table 2). To configure the master port as a DTE port move dipswitch “SW1”, position 8, to the "ON" position. When the master port is configured as a DTE port, ports A, B, C, & D will become DCE ports (Refer to Table 3). Always power down the smart switch when changing switch settings.

Table 2. DCE MASTER PORT CHART

Master Port

 

A,B,C & D Ports

 

(DCE)

Signal

 

(DTE)

Pin#

 

Direction

Description

Pin#

Direction

2

 

Input

Transmit Data (TD)

3

Output

3

 

Output

Receive Data (RD)

2

Input

4

 

Input

Request to Send (RTS)

7

Output

5

 

Output

Clear to Send (CTS)

8

Input

7

 

<------->

Signal Ground (SG)

5

<----->

4Documentation Number 232MSS2-0108 Manual

B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104

B&B Electronics Ltd – Westlink Commercial Park – Oranmore, Galway, Ireland – Ph +353 91-792444 – Fax +353 91-792445

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Contents Mini Smart Switch CE Page Table of Contents Table of Contents Documentation Number 232MSS2-0108 Manual Introduction Checklist Setup Communication & Port Setup Dipswitch SW1 3 4 5 6 7 SettingPin# Direction Description Port ConfigurationDCE Master Port Chart C & D Ports DTE Master Port Chart C & D Ports Serial Data ConfigurationSmart Switch Operation ESC STX B Programmable Character Setting Dipswitch SW2* WeightProgramming the Second Character Binary File TransferSmart Switch/Port Combiner Mode Enhanced Mode -- Timer Features Timer Values Specifications Model 232MSS2Documentation Number 232MSS2-0108 Manual Windows SSwitch InstallationRunning SSwitch Software IntroductionSETUP.EXE Method preferred DOS SstsrCommand Description Options SSTSR.EXE MethodPort Address ParametersType Sstsr A03F8 B7 D8 P1 U8 H6 and press the Enter key Selecting Ports Default ValuesHelp Screen Un-Install Hot Key Method Command Line Method Documentation Number 232MSS2-0108 Manual Appendix a Decimal to HEX to Ascii Conversion Table Appendix B Chart 1. IBM PC DB25 Connector to Master Port Chart 2. IBM PC DB9 Connector to Master PortChart 3. Modem DB25 Connector to Master Port Async Modem Chart 4. IBM PC DB25 Connector to Ports a D DTEDB9 Connector Direction 232MSS2 Ports a D DTE Chart 5. IBM PC DB25 Connector to Ports a D DCEChart 6. IBM PC DB9 Connector to Ports a D DTE Chart 7. IBM PC DB9 Connector to Ports a D DCE DB9 Connector Direction 232MSS2 Ports a D DCEChart 8. IBM PC DB25 Connector to Ports a D DCE DB25 Connector Direction DB9 ConnectorChart 9. IBM PC DB9 Connector to Ports a D DCE DB9 Connector DirectionAppendix C Declaration of Conformity Declaration of ConformityAppendix C Documentation Number 232MSS2-0108 Manual