Instruction Manual

Instruction Manual Supplement
D103639X012
DVC6200 Digital Valve Controller
August 2014
11
Command 17: Write Message
This command allows you to write a 24 character informational message into the device.
However, per common implementation of Emerson devices, writing a specific string to the Message field will signal
the device to transition operation from HART 5 to HART 7 mode and vice versa. The original message in the device will
not be altered if these strings are encountered.
To switch HART versions, send one of the following strings.
To switch to HART 5 mode: send “HART5”.
To switch to HART 7 mode: send “HART7”.
Byte Format Description
Request
Data bytes
023 Packed
A message string used by the master for HART Mode switching.
HART 7
20 14 94 DE 08 20 82 08 20 82 08 20 82 08 20 82 08 20 82 08 20 82 08 20
HART 5
20 14 94 D6 08 20 82 08 20 82 08 20 82 08 20 82 08 20 82 08 20 82 08 20
Response
Data Bytes
023 Packed Message String
Code Class Description
Command
Related
Response
Codes
0 Success No command specific errors
5 Error Too few data bytes
6 Error Device Specific command error
7 Error In write protect mode
16 Error Access Restricted
32 Error Busy