Rockwell Automation 2706-F11J_F11JC_F21J_F21JC DL50 INSTALLATION MANUAL - Manual (Page 67)

Chapter 6
Slave Mode Operation / Examples
6–3
Example 2 (Duplex Protocol)
Command Function: Display message shown below on all DL50 message
displays.
Motor ON
The command specifies message attributes of roll in display mode, fast
display speed, 4.8 inch text, and annunciation relay on.
Address 255 specifies that the message is displayed on all DL50s.
The host would need to send the following data (Duplex Protocol):
Ctrl-B
(Decimal 2)
Field 1
Control Byte
M
(Decimal 77)
1 byte
Field 2
ASCII Text
1 of 8 bytes 2 of 8 bytes 3 of 8 bytes 4 of 8 bytes 5 of 8 bytes
o
(Decimal 111)
t
(Decimal 116)
o
(Decimal 111)
r
(Decimal 114)
SPACE
(Decimal 32)
O
(Decimal 79)
Field 2
ASCII Text
7 of 8 bytes 8 of 8 bytes
N
(Decimal 78)
255
Decimal
1
Decimal
CR
(Decimal 13)
Field 2
ASCII Text Field 2
ASCII Text Field 2
ASCII Text Field 2
ASCII Text
6 of 8 bytes
Field 2
ASCII Text Field 2
ASCII Text Field 3
Slave Address Field 4
Line Number
1 byte 1 byte
Field 5
Carriage Return
165
Decimal
200
Decimal
2 of 3 bytes 3 of 3 bytes
128
Decimal
0
Decimal
05
Decimal
202
Decimal
1 of 3 bytes
Field 6
Message Attributes Field 7
Checksum Field 7
Checksum Field 7
Checksum
1 byte
Field 6
Message Attributes Field 6
Message Attributes
2 of 3 bytes 3 of 3 bytes 1 of 3 bytes
Append & Display
Message
Fast Display,
Roll in
Relay On
4.5 Inch text
Always Set
to 128
Message Text
Message Text
Checksum Bytes
A simple BASIC program for a host PC to send the message would be:
100: Print #1, CHR$(2) + “Motor ON” + CHR$(255) + CHR$(1) + CHR$(13) + CHR$(165) +
HR$(200) + CHR$(128) + CHR$(0) + CHR$(05) + CHR$(202 )
Note: Refer to Appendix F for checksum calculations.