Spectrasensors SS1000 - Reading;Writing in Gould Modbus Mode; To Enable Modbus Communications

Serial Port Communications
401-92-4 A .ver 97020-00094
–13
Reading/Writing in Gould Modbus Mode
Gould Modbus supports three types of variable data, short integer, long integer
and floating point, but all registers are addressed as word (two byte) registers.
A “short integer” value is contained in one register whereas a “long integer” or
“floating point” value requires two contiguous registers. The registers are
defined as Read or Read/Write.
An appropriate password must be downloaded to the password register prior
to writing to most registers. The User Level 1 (L1)
user password 314
2 will
allow access to those registers which have been pre-defined as user
configurable. Other writable registers can only be downloaded or changed by
SpectraSensors support personnel using a User Level 2 (L2) password.
To enable Modbus communications:
1. Confirm that the serial cable has been properly connected. See
“Connecting the Output Signals” on page 2-5.
2. Power up the analyzer (see “Powering Up the Analyzer” on page
3-1).
3. Press the # key followed by the 2 key (Channel A) or the # key
followe
d by the 3 key (Channel B). The LCD prompts for a numeric
password. Enter the user password (3142) on the keypad, then
press the * key to enter the number to enter Mode 2 (Set Parameter
Mode - Channel A) or Mode 3 (Set Parameter Mode - Channel B).
Use caution when writing to registers as changing the value of a
writable register may affect the calibration of the analyzer.
<SET PARAMETER MODE>
Enter password
v2.41 08-12-08 DM
<SET PARAMETER MODE>
S Factor
1.00000
Enter a value
UK Distibution by IMA Ltd Tel: +44 (0)1943 878877 Email: info@ima.co.uk Web: www.ima.co.uk