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Node Number The block format includes a node number so that the host computer can identify

the Unit that the host computer is communicating with. If the Unit is a CPU, the

node number set in the PC Setup must be used (the node number is called the

unit number in the PC Setup). If the Unit is a Host Link Unit using port 1, 00 (30,

30) must be used. If the Unit is a Host Link Unit using port 2, the value set on the

node number setting switch on the front panel of the Host Link Unit must be des-

ignated.

4-3-3 Blocks over 131 Characters Long

Each block is usually made up of one Unit called a frame, but long blocks of data

(over 131 characters) must be divided into more than one frame. The first frame

can have up to 131 characters, and subsequent frames can have up to 128 char-

acters. In this case, the beginning and intermediate blocks end with a delimiter

(CR), instead of a terminator (*CR).

xx xx

Node

No.

Header Text no. 1 (123 characters max.) FCS

Text no. 2 (125 characters max.) FCS Delimiter

Text no. 3 (124 characters max.) FCS Terminator

x 10

FCS calculation range (refer to page 56)

First Frame (131 Characters or Less)

FCS calculation range (refer to page 56)

Intermediate Frame(s) (128 Characters or Less)

FCS calculation range (refer to page 56)

Last Frame (128 Characters or Less)

Delimiter

Note Do not separate a single word of data into different frames for any write com-

mand (such as WR, WL, WH, WC, or WD).

C-mode Commands Section 4-3

Omron SYSMAC CV1000 User Manual

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