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Appendix
Table 1 Commands (continued) (All bytes are in hex)
FUNCTION
Set On/Off Array
The Set On/Off Array command is used to set and/or request chiller settings. Depending on the soft-
ware version, the array consists of up to 5 data bytes, d1 - d5. Each byte represents the state of one
setting, see ** below. The master can send the array with a value of 0 (turn off/disable), 1 (turn on/
enable), or 2 (do not change). 0 or 1 causes the chiller to change the setting, 2 only requests the state
of a setting. The slave returns values of 0 (off/disabled) or 1 (on/enabled).
(SW Version 02950.1A-E)
(SW Version 02950.1F-H)
(SW Version 02950.1J-K)
(SW Version 02950.1L- )
Sample - turn chiller on (02950.1J-K)CA 00 01 81 05 01 02 02 02 02 6F
* = limited to the range of the chiller
command bytes shown in bold
qb = qualifier byte, see Table 2
d1,d2 = 16 bit signed integer of the value being
sent or received
cs = the checksum of the string (see text)
Table 2
QUALIFIER BYTE
00
0 precision, no units of measure
01
0 precision, °C
10
1 precision, no units of measure
11
1 precision, °C
20
2 precision, no units of measure
Example: The temperature of 45.6°C would be represented by the qualifier 11 hex, followed by the 2
bytes 01 C8 hex (456 decimal).
Table 3 READ STATUS
BIT
b.7 = 1
b.6 = 1
b.5 = 1
b.4 = 1
b.3 = 1
b.2 = 1
b.1 = 1
b.0 = 1
t d2 is the detail of fault d1-b.1
* mutully exclusive
A - 4
Merlin
MASTER SENDS
CA 00 01 81 01(d1)(cs)
CA 00 01 81 04(d1)... (d4)(cs)
CA 00 01 81 05(d1)... (d5)(cs)
Any of the above formats
d1
External Temp Sensor Enabled Reserved
Level 1 Warning/Auto Refill
Low Flow Warning
Low Level 2 Warning
High or Low Temp Warning
High or Low Temp Bypass
Chiller Faulted*
ChillerRunning*
CHILLER RESPONDS
CA 00 01 81 01(d1)(cs)
CA 00 01 81 04(d1)... (d4)(cs)
CA 00 01 81 05(d1)... (d5)(cs)
**d1 - chiller off = 0, on =1
d2 - external sensor disabled = 0, enabled = 1
d3 - fault mode disabled = 0, enabled = 1
d4 - tenths display disabled = 0, enabled = 1
d5 - Alarms on internal = 0, or external
sensor = 1, (1 is invalid when d2 = 0, external
sensor disabled)
t
d2
Reserved
Internal Temp Sensor Fault
External Temp Sensor Fault
High Temp/Fixed High Temp Fault
Low Temp/Fixed Low Temp Fault
Low Flow Fault
Low Level 2 Fault
Thermo Scientific
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