Serial Communications; Table 4-66 Serial Communications Prompts - Honeywell VPR100 User Manual

4.21 Serial Communications

Serial Communications is an optional feature that lets the instrument exchange data with a host device (a PC
running Honeywell or other compatible software) on an RS422/485 data link. Using Honeywell protocols,
Binary or Modbus RTU, this link can be used to transfer configurations and data. Set up the link as follows.
Table 4-66 describes the Serial Communications prompts.
Prompt
UNIT ADDRESS 1-254
PROTOCOL Binary, Modbus RTU
BAUD RATE 1200, 2400, 4800,
9600, 19200, 38400,
76800.
PARITY EVEN, ODD, NONE
BYTE ORDER
FP B
FP BB
FP L
FP LB
DOWNLOAD YES, NO
LOCKOUT
12/00

Table 4-66 Serial Communications Prompts

Range/Selections
Enter the unit's address. Use a number once only so that each
address on the link is unique.
Select the correct protocol.
Enter the speed of data transfer. All equipment on the link must
be set to match the host setting.
Appears for binary protocol only. All equipment on the link must
be set to match the host setting.
Appears for Modbus protocol only.
Example
Decimal number 25.38
| Floating point number |
| Register 1 | Register 2 |
Choice
FP B
FP BB
FP L
FP LB
Set to YES to prevent configurations from being downloaded from
a PC with SCF software.
VPR & VRX – User Manual
Programming Function Blocks and Features
Definition
Meaning Byte Order
Big Endian 0123
Big Endian Byte Swap 1032
Little endian 3210
Little endian Byte swap 2301
Result for 25.38
41 CB 0A 3D
CB 41 3D 0A
3D 0A CB 41
0A 3D 41 CB
165