NCR 7870 manual Common Byte 1 and Common Byte

Chapter 7: Programming 7-35

2.None -- Scan the Hex 2 tag to select none. No label identifiers are added to the message data.

3.Unique Prefix – - To use a unique prefix, scan the Hex 3. A Unique Identifier is associated with each bar code type. Also, you may use one, two, or no Common Bytes. The figure shows the possible message formats when using a unique prefix. The formats do not show other elements programmed in the other RS-232 programming modes.

Unique Prefix - All Bar Codes
Unique Identifier	Bar Code Data
Common Byte 1	Unique Identifier	Bar Code Data
Common Byte 2	Unique Identifier	Bar Code Data
Common Byte 1	Common Byte 2	Unique Identifier	Bar Code Data
Unique Prefix - UPC Version D
Unique Identifier	Bar Code Data
Common Byte 1	Unique Identifier	Bar Code Data
Common Byte 2	Unique Identifier	Bar Code Data
Common Byte 1	Common Byte 2	Unique Identifier	Bar Code Data
Unique Identifier	Version Number	Bar Code Data
Common Byte 1	Unique Identifier	Version Number	Bar Code Data
Common Byte 2	Unique Identifier	Version Number	Bar Code Data

Common Byte 1 Common Byte 2 Unique Identifier Version Number Bar Code Data

R0147

Common Byte 1 and Common Byte 2

The Common Byte 1 and Common Byte 2 parameters permit you to specify the data sent to the host terminal in the Common Byte fields. Enter this information as two Hex characters for each Common Byte.