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)
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
ç
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:
Turning the
controller off and
on again resets
SPEE to 0 and
restores the last
stored set point.
NOTE:
The number of
decimal places
returned by many
of these
commands is
determined by the
DEC1, DEC2, IN1
or IN2 setting.
