Serial Communications; Table 4-67 Serial Communications Prompts - Honeywell VRX180 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 Modbus RTU
protocol, this link can be used to transfer configurations and data. Set up the link as follows.
Table 4-67 describes the Serial Communications prompts.

Table 4-67 Serial Communications Prompts

Prompt
UNIT ADDRESS 1-254
BAUD RATE 1200, 2400, 4800,
9600, 19200, 38400,
76800.
DOWNLOAD YES, NO
LOCKOUT
BYTE ORDER FP_B : Big Endian
FP_BB : Big Endian
with Byte swap
FP_L : Little Endian
FP_LB : Little Endian
with Byte swap
Range/Selections
Video Recorder – User Manual
Programming Function Blocks and Features
Enter the unit's address. Use a number once only so that each
address on the link is unique.
Enter the speed of data transfer. All equipment on the link must
be set to match the host setting.
Set to YES to prevent configurations from being downloaded from
a PC with SCF software.
This feature allows a user to select the byte order for a floating
point register.
Example for 25.38 :
Byte order
FP_B
FP_BB
FP_L
FP_LB
Definition
Result
0123 41CB0A3D
1032 CB413D0A
3210 3D0ACB41
2301 0A3D41CB
161