Honeywell VRX180 Manuale Utente

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. 

UNIT ADDRESS 

1-254 

Enter the unit’s address.  Use a number once only so that each 

address on the link is unique. 

BAUD RATE 

1200, 2400, 4800, 
9600, 19200, 38400, 
76800. 

Enter the speed of data transfer. All equipment on the link must 
be set to match the host setting. 

DOWNLOAD 

LOCKOUT 

YES, NO 

Set to YES to prevent configurations from being downloaded from 
a PC with SCF software. 

BYTE ORDER 

FP_B : Big Endian 

FP_BB : Big Endian 
with Byte swap 

FP_L : Little Endian 

FP_LB : Little Endian 
with Byte swap 

This feature allows a user to select the byte order for a floating 
point register. 

 

Example for 25.38 : 

  

 

Byte 

order 

Result 

  

FP_B 

FP_BB 

FP_L 

FP_LB 

0123 

1032 

3210 

2301 

41CB0A3D 

CB413D0A 

3D0ACB41 

0A3D41CB