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2-WIRE RS-485 TESTING

USING LOOPBACK OR WITHOUT LOOPBACK

PAGE 1 OF 9

Q: How Can I Check My "2-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 can be enabled (Echo On or RS-422 RX Enable) as in 4-wire

mode, and the TD(A) & RD(A) connected, and the TD(B) & RD(B) connected as in 2-wire mode,

to "loop" the output back to the inputs. Refer to the Table for a list of models with a easily moved

Echo/RX Enable Switch or Jumper. With some converter models Echo can be changed by

soldering, but to keep things simple, this procedure does not cover that option.

When you have a converter without a Echo On option, you need a second RS-485 port or

converter to receive the signal transmitted by the first OR to transmit a signal to be received by

the first. This is because a 2-wire RS-485 port is half duplex. It either transmits or receives, but

not both at the same time. While transmitting, receive is disabled, while receiving, transmit is

disabled and tri-stated. The Data A(-) line from one converter is connected to Data A(-) on the

other, and the Data B(+) from the first is connected to Data B(+) on the second.

A terminal program is opened to access one port for transmit, another port for receive, and data is

transmitted from the first port to the second. Next data is transmitted from the second to the first.

If data is received and transmitted in both directions, the port/converters are most likely fine.

ComTest (a B&B program) can open two sessions, one to access each Com port being used.

Serial Card Models With RS-485

(All have Rx Jumper)

Set RX Jumper to 422 mode

RS-485 Models With

Receive/Echo

Jumpers or Switch

RS-485 Models

No Echo Jumper

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

485CARLP9A

485COSN*

485COSR*

485LP9N

485LP9R

485LP9TB

485LPCOR*

485SD9TB

485LP9TBN

485LPRJ

485PTBR*

485SD9R

485SD9RJ

* solder echo

1 2 3 4 5 6 7 8 9

Indice de contenidos

Pagina 1 - PAGE 1 OF 9

2-WIRE RS-485 TESTING USING LOOPBACK OR WITHOUT LOOPBACK PAGE 1 OF 9 Q: How Can I Check My "2-Wire" RS-485 Port or Converter To Verify Op

Pagina 2

2-WIRE RS-485 TESTING USING LOOPBACK OR WITHOUT LOOPBACK PAGE 2 OF 9 Windows 95/98/SE/ME/2000 or NT 4.0: Use ComTest from our Website to check seri

Pagina 3 - PAGE 3 OF 9

2-WIRE RS-485 TESTING USING LOOPBACK OR WITHOUT LOOPBACK PAGE 3 OF 9

Pagina 4

2-WIRE RS-485 TESTING USING LOOPBACK OR WITHOUT LOOPBACK PAGE 4 OF 9 CONNECTIONS - Models With Echo Jumper Continued Next Page

Pagina 5 - PAGE 5 OF 9

2-WIRE RS-485 TESTING USING LOOPBACK OR WITHOUT LOOPBACK PAGE 5 OF 9 CONNECTIONS - Models Without Echo Jumper USING COMTEST TO CHECK OPERATION -

Pagina 6

2-WIRE RS-485 TESTING USING LOOPBACK OR WITHOUT LOOPBACK PAGE 6 OF 9 5. If you are checking a RTS Controlled Converter or port: Select Options, th

Pagina 7 - PAGE 7 OF 9

2-WIRE RS-485 TESTING USING LOOPBACK OR WITHOUT LOOPBACK PAGE 7 OF 9 10. Type some characters in the upper window for one converter. If the convert

Pagina 8

2-WIRE RS-485 TESTING USING LOOPBACK OR WITHOUT LOOPBACK PAGE 8 OF 9 B&B Electronics ComTest – A Serial Test Program For Port & Converter

Pagina 9 - PAGE 9 OF 9

2-WIRE RS-485 TESTING USING LOOPBACK OR WITHOUT LOOPBACK PAGE 9 OF 9 To Send Non-printable Characters Using Com Test You can send non-printable co

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