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
6.8
Command Summary Series 986-989, Chapter 6
ITY2 Input 2 ? <sp> ITY2 <cr> 0 = None
131 Hardware Type 1 = t/c only
2 = Current
3 = Slide wire
4 = Input off
5 = Universal RTD
6 = Universal high gain t/c
7 = Universal low gain t/c
8 = Universal millivolts
9 = Universal process
10 = Event input
LAT2 Alarm 2 Latching ? <sp> LAT2 <cr> 0 = Latching alarms
76 = <sp> LAT2 <sp> data.2 <cr> 1 = Non-latching alarms
Default: 1
LAT3 Alarm 3 Latching ? <sp> LAT3 <cr> 0 = Latching alarms
82 = <sp> LAT3 <sp> data.2 <cr> 1 = Non-latching alarms
Default: 1
LIN1 Linearization ? <sp> LIN1 <cr> 0 = None
54 Process Input 1 = <sp> LIN1 <sp> data.2 <cr> 1 = Square root extraction
Default: 0
LIN2 Linearization ? <sp> LIN2 <cr> 0 = None
64 Process Input 2 = <sp> LIN2 <sp> data.2 <cr> 1 = Square root extraction
Default: 0
LOC Keyboard Lockout ? <sp> LOC <cr> 0 = No lockout
112 = <sp> LOC <sp> data.2 <cr> 1 = Lock out mode key
2 = Lock out mode and auto/manual keys
3 = Lock out all single keys
Default: 0
LOP Low Power Limit ? <sp> LOP <cr> -100% to HIP (%)
107 = <sp> LOP <sp> data.2 <cr> Default: -100% (Heat / cool)
Default: 0% (Heat only)
LRNH Learn High Slide- ? <sp> LRNH <cr> 0 = No function
62 wire Resistance = <sp> LRNH <sp> data.2 <cr> 1 = Learn
Default: 0
LRNL Learn Low Slide- ? <sp> LRNL <cr> 0 = No function
61 wire Resistance = <sp> LRNL <sp> data.2 <cr> 1 = Learn
Default: 0
LR Local-Remote ? <sp> LR <cr> 0 = Local set point
20 Set Point Select = <sp> LR <sp> data.2 <cr> 1 = Remote set point
Default: 0
MDL Model Number ? <sp> MDL <cr> 988 (986-989 units)
0
OT1 Output 1 Action ? <sp> OT1 <cr> 0 = Heat
67 = <sp> OT1 <sp> data.2 <cr> 1 = Cool
OT2 Output 2 Action ? <sp> OT2 <cr> 0 = Heat
70 = <sp> OT2 <sp> data.2 <cr> 1 = Cool
2 = None
3 = Alarm 2
4 = Alarm 2 reverse acting
Table 6.8 -
ITY2 to OT2
รง
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:
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.)