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Getting started
January 2021
4.4.18
Serial communications
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This section is applicable if the RS232 serial port of a communication device (e.g. a PC) is
connected:
•
Directly to the RS232 terminals of the Rosemount 3491 or 3492 Control Unit, or
•
Indirectly via factory-fitted data download socket of the Rosemount 3493 control unit.
Table 4-39: Serial Communications Parameters
Parameter
P710
P711
P712
P713
P714
P715
P716
Related information
RS232 connections
4.4.19
Set-up the PIN security
Personal Identification Number (PIN) security prevents unauthorized people from
configuring the control unit. Typically, this is set-up when all the other programming has
been completed. As with bankcards, there is one PIN number. The factory default is for PIN
security to be inactive.
After PIN security is activated, a prompt for the PIN appears when needed for
authorization. If correctly entered, no further PIN requests are made unless there is a
period of keypad inactivity, or the Cancel Password option is selected from the MAIN
MENU screen.
132
SETUP → [CONTROLLER] → SYSTEM → COMMUNICATIONS
Description
Address
Keep the factory default setting.
Interface
Select between Log download (Rosemount 3493),
RS232 HART, or None.
Baud Rate
This must be the same as set for the RS232 serial
port of the communication device. Range is 1200 to
115200.
Start Bits
This must be the same as set for the RS232 serial
port of the communication device. Range is 0 to 9.
Data Bits
This must be the same as set for the RS232 serial
port of the communication device. Range is 0 to 9.
Parity
This must be the same as set for the RS232 serial
port of the communication device. Options are Even,
Odd or None.
Stop Bits
This must be the same as set for the RS232 serial
port of the communication device. Range is 0 to 9.
Reference Manual
00809-0100-4841
Factory default
0
1200 or 9600
1
8
Even
1
Emerson.com/Rosemount
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