Rockwell Automation 2706-F11J_F11JC_F21J_F21JC DL50 INSTALLATION MANUAL - Manual (Page 62)

Chapter 5
Serial Communications
5–12
Field 6: Message Attributes (continued)
Table 5.I
Bits 5 through 7 of the Message Attribute 1st Byte
Function Bits 7 z 5 ➀ Decimal Value ➁
Fastest Display 1 0 0 128
Fast Display 1 0 1 160
Slow Display 1 1 0 192
Slowest Display 1 1 1 224
➀ Bit 7 is always set to 1.
➁ Add decimal values for all bits within a byte to determine value of the entire byte.
Text Height / Relay Control- The second byte of the Message Attributes
field specifies the text height and relay operation. The first three bits are
reserved for future use. The third and fourth bits specify the text height. The
sixth bit is reserved, the seventh bit controls the operation of the relay, and
the eighth bit is always set to one.
Bit
7
Bit
6 Bit
5
Bit
4
Bit
3
Bit
2
Bit
1
Bit
0
Always Set
To 1
Set Bits 3 and 4
using Table 5.E
0 = Relay Off
1 = Relay On
Reserved
Set to 0
Text Height
Reserved
Set to 0
Relay Operation
Table 5.J
Bits 3 and 4 of the Message Attribute 2nd Byte
Text Height Bits 4 z 3 Decimal Value ➀
2.1 Inch (53.3mm) Text 0 0 0
4.8 Inch (12 1.9 mm) Text 0 1 8
Reserved 1 0 16
Reserved 1 1 24
➀ Add decimal values for all bits within a byte to determine value of the entire byte.
Note: Bit 6 of message attribute 2nd byte:
Relay On = decimal value of 64
Relay Off = decimal value of 0
Bit 7 of message attribute 2nd byte always = decimal value of 128
Duplex Protocol (continued)