B&B Electronics 3PXCC2a Bedienungsanleitung PDF herunterladen

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Q: How Can I Check My "4-Wire" RS-485 Port or Converter To Verify Operation?

A: When you're using a RS-485 converter that can be set up for 2-wire or 4-wire RS-485

operation, the RS-485 Receiver must be enabled (Echo On or RS-422 RX Enable) and the

Transmitter set to RS-485 Transmit mode. If the port or converter is the only Master talking to all

the Slaves, the Transmitter can be set to Enabled as in RS-422 mode, since the Transmit lines to

all the Slave Receivers don't need to be shared.

To test the Transmitter outputs and Receiver inputs, the Transmit signals are connected to the

Receive inputs. Bridge (connect) the TD(A) line to the RD(A) line, and the TD(B) line to the

RD(B) line (similar to 2-wire mode). Refer to Connection figures for loopback connections.

Refer to the Table for a list of models and jumper or switch settings. Some converter models

require Echo On or Receive Enable to be set by unsoldering a part or cutting a trace.

Serial Card Models With RS-485

(All have Rx Jumper)

RX Jumper must be set to 422 mode

RS-485 Models With

Receive/Echo

Jumpers or Switch

RS-485 Models

Solder Echo

ISA BUS

3PXCC1A JP1C - port A

3PXCC2A JP1C - port A

JP2C - port B

3PXCC4A JP8 RX - port A

JP10 RX - port B

JP14 RX - port C

JP12 RX - port D

3PXOCC1A JP3 RX

3PCOCC2A JP1B RX - port A

JP2B RX - port B

3PXSD4A JP3 RX - port A

JP4 RX - port B

JP7 RX - port C

JP8 RX - port D

PCI BUS

3PCIOSD1A JP4 RX

3PCIOSD2A JP4 RX - port A

JP6 RX - port B

3PCISD1A JP1B (RX)

3PCISD2A JP1B(RX)- port A

JP4B(RX)- port B

3PCISD4A JP3BRX - port A

JP4B RX - port B

JP6B RX - port C

JP7B RX - port D

485BAT3 - sw1B Off

485CON - install no

jumper pins#18 & 21

485COR - install no

jumper pins#18 & 21

485CSP2 - Echo on

485DRC - sw2 Off

485DRJ - sw4 Off

485HSPR - JP2 Off

485LDRC - sw2 Off

485OI9TB - JP1B On

485OIC - JP1 Off

485OICR - JP1 Off

485OISPR - JP2 Off

422OPINB - JP4 422

485OT9L - sw5 Off

485OTLED - sw5 Off

485TBLED - Echo On

485COSN - remove R7

485COSR - remove R7

485LPCOR - cut trace

as shown on Fig 2 on

Data Sheet.

485PTBR - remove R9

Windows 95/98/SE/ME/2000 or NT 4.0: Use ComTest from our Website to check serial ports

assigned Com1 or higher under Windows. It can access Com ports 1-8, including USB serial

devices. ComTest will let open two different ports to check data from one to another or set DTR

high to power a port powered device and raise RTS to transmit and lower it to receive with RTS

controlled Converters or ports. ComTest Features are listed starting on page 6 of this FAQ.

MS-DOS: Use Simpterm from our Website to check motherboard or ISA based serial ports under

DOS. Do not use SimpTerm with Windows. The procedure is similar, but operating details are

different.

4-WIRE RS-485 TESTING

LOOPBACK CHECKS

1 2 3 4 5 6 7

Inhaltsverzeichnis

Seite 1 - LOOPBACK CHECKS

PAGE 1 OF 7 Q: How Can I Check My "4-Wire" RS-485 Port or Converter To Verify Operation? A: When you're using a RS-485 converter th

Seite 2

PAGE 2 OF 7 Download & Install The Program 1. Before starting, make a Directory Folder (such as Test) on your hard drive to use when downloadin

Seite 3 - PAGE 3 OF 7

PAGE 3 OF 7 Note: DB9 & DB25 pin numbers are molded into the connector. To locate pin #1 on the male connector hold the connector horizontal

Seite 4

PAGE 4 OF 7 CONVERTER CONNECTIONS Continued Next Page 4-WIRE RS-485 TESTING LOOPBACK CHECKS 4-WIRE RS-485 TESTING LOOPBACK CHECKS

Seite 5 - PAGE 5 OF 7

PAGE 5 OF 7 USING COMTEST TO CHECK OPERATION 1. Make the Test Connections for Loopback and the required setting to Enable RX or Echo. You shoul

Seite 6

PAGE 6 OF 7 B&B Electronics ComTest – A Serial Test Program For Port & Converter Testing With Windows - A Test Program for Simple Checks

Seite 7 - PAGE 7 OF 7

PAGE 7 OF 7 To Send Non-printable Characters Using Com Test You can send non-printable control characters in a control string by pressing the Alt k

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