Connecting to the Host’s RS-422A/485 Port

Section 5-2

When using the Memory Link Method

Allocated DM Area

Setting

Setting Contents

words

 

 

 

 

 

Port 2

 

 

 

 

 

DM32011

000A

Baud rate (standard)

 

 

 

DM32016

000@

@ = The highest unit number of the connected

 

 

PTs (0 to 7)

*1 For example, when connecting PTs with model numbers 3, 4, 5, and 6 to port 2, set the value 8200 hex to DM32010, 000A hex to DM32011, and 0006 hex to DM32016.

Connecting to a CS/CJ-series Serial Communications Unit

CS/CJ-series Rack-mounting Units:

CS1W-SCU31-V1 (Port 1 and 2 are RS-422A/485 port.)

CJ1W-SCU31-V1 (Port 1 and 2 are RS-422A/485 port.)

CJ1W-SCU41(-V1) (Port 1 is an RS-422A/485 port.)

Setting the Front Switches

Set the unit number of the Serial Communications Unit using the rotary switches on the front of the Unit. Set the number or symbol in the setting dis- play window in the following way using a flat-blade screwdriver. When using a CS/CJ-series Serial Communications Unit set the switches as shown below.

2-wire or 4-wire selector (WIRE): 4

(4-wire = RS-422A), or

2

(2-wire = RS-485)

Terminating resistance switch (TERM): ON (terminator ON = terminating resistance enabled).

DM Area Allocation Settings

From the Programming Device (i.e., a Programming Console or CX-Program- mer), write the settings directly to the CPU Unit's DM Area Setup Area. After the settings have been written, they will be enabled when the power supply is cycled, the Unit is restarted, the communications port is restarted, or a STUP instruction is executed.

The DM Area words that are allocated and the contents of the settings are given in the following table.

 

 

 

 

m = DM 30000 + 100 unit number

 

 

 

Allocated DM Area

Setting

Setting Contents

 

words

 

 

 

 

 

 

 

Port 1

 

Port 2

 

 

 

 

 

 

 

m

 

m+10

8200

1:N NT Link Mode

 

 

 

 

 

m+1

 

m+11

000A

Baud rate (standard)

 

 

 

 

 

m+6

 

m+16

000@

@ = The highest unit number of the con-

 

 

 

 

nected PTs (0 to 7)

With the memory link method, the connection can be made to a personal computer and an FA computer with RS-422A.

When connecting to the host with the memory link method, it is necessary to create a program for the memory link at the host side.

114

Page 131
Image 131
Omron NT631C manual 114