Remote-processing RPC-210 Bedienungsanleitung PDF herunterladen (Seite 21)

SERIAL & SPI PORTS BASIC SECTION 4

Page 4-3

Figure 4-3 RS-485 topology

RS-422/485 OPERATING INFORMATION

J6 is the RS-422/485 port. There are several things to

consider when using this port. These include 2-wire vs

4-wire system, last unit term ination, and pr otocols.

A common misconception is that RS-422 or RS-485

defines a protocol. They do not. What these two

standards specify are electrical parameters (voltage

levels, distances, rise and fall times). They say nothing

about baud rates, let alone how two systems talk to each

other.

RS-422/485 setup

There are 3 jumpers to set when using RS-422/485 on

the RPC-210.

W5[2-3] Set to receive RS-422/485

W6 2 wire or 4 wire RS-485

W10[1-2],[3-4] Termination

W5 must be set in order to receive RS-422 or RS-485

data.

J6 Pin out

J6 is a 5 pin, single in line header. Use the table below

for a pin out.

Pin # Designator Function

1 T+ Transmit out, non inverting

2 T- Transmit out, inverting

3 Gnd Signal ground

4 R+ Receive input, non-inverting

5 R- Receive input, inverting

Below are some connector manufacturers and associated

parts that may be used with J6. Parts were offered from

Digi-Key as of May, 2000. Contact them at 800-344-

4539 or www.digikey.com.

Manufacturer Connector P/N Contact P/N

Molex -

GC/Waldom

22– 1-3057 08-55-0102

AMP 87499-9 87667-3 (nickel

plate) or

87667-2 (gold)

Amp/Digikey Cable A9BAG-

050XF-ND

X = cable

length of 2, 3,

4, 5, 6, or 8 ft.

There are other connector types the above manufacturers

make as well as other manufacturers.

Two- and four- wire RS-485

W6 is used in conjunction with RS-485. When W6[1-2]

is set, 2-wire RS-485 is allowed. See Figure 4-2 above

for jumper locations. T ransmit and receive lines from J6

must be routed in parallel as follows:

J6-1 to J6-4

J6-2 to J6-5

This jumper configuration disables the receiver when the

transmitter is active.

When W 6[2-3] is set, 4-wire RS-485 and RS-422 is

allowed. Transmit and r eceive can operate

simultaneously in this mode as each has its own pair of

lines.

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