User guide

Data Communications with the Watlow Series 988 Family
Temperature/process Controller Prompt Table
986, 987,
988, 989
Name Description Read (?) and/or Write (=) Syntax Range
data.1 data.2
Modbus
address
6.12
Command Summary Series 986-989, Chapter 6
SP2 Set Point 2 ? <sp> SP2 <cr> RL1 to RH1
8 Heat/Heat or = <sp> SP2 <sp> data.2 <cr> Default: per input range (?)
Cool/Cool Only
SP2C Set Point 2 Type ? <sp> SP2C <cr> 0 = Process
73 = <sp> SP2C <sp> data.2 <cr> 1 = Deviation
Default: 0
SPEE Write Set Point ? <sp> SPEE <cr> 0 = Saves set point in EEPROM
143 to EEPROM = <sp> SPEE <sp> data.2 <cr> 1 = Does not save set point in EEPROM
Default: 0 (See Note 1)
STPT Set Point Value ? <sp> STPT <cr> RL1 to RH1
103 PID A <-> B Switch = <sp> STPT <sp> data.2 <cr> Default: Sensor type low range
SYS Lockout System ? <sp> SYS <cr> 0 = No lockout
113 Menu = <sp> SYS <sp> data.2 <cr> 1 = Read only
2 = No read or write
Default: 0
TOUT Test Outputs = <sp> TOUT <sp> data.2 <cr> 1 = Output 1 on
137 2 = Output 2 on
3 = Output 3 on
4 = Output 4 on
Table 6.12 -
SP2 to TOUT
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CAUTION:
Avoid writing <=>
continuously,
such as ramping
set points or
repetitive loops, to
the Series 986-989
EEPROM memory.
Continuous writes
may result in
premature control
failure, system
downtime and
damage to
processes and
equipment.
NOTE 1:
Turning the
controller off and
on again resets
SPEE to 0 and
restores the last
stored set point.
NOTE 2:
The number of
decimal places
returned by many
of these
commands is
determined by the
DEC1, DEC2, IN1
or IN2 setting.
(This does not
apply to Modbus
Protocol.)