Thermo Scientific NESLAB EX Series Installation, Operation And Maintanance Manual page 52

Table 1 (All bytes are in hex)
RS-232. For RS-485 substitute CC for CA as the lead character.
FUNCTION
READ
Read Acknowledge
Read Status*
Read Internal Temperature
Read External Sensor
Read Setpoint (control point)
Read Low Temperature Limit
Read High Temperature Limit
Read Heat Proportional Band (P) CA 00 01 71 00 8D
Read Heat Integral (I)
Read Heat Derivative (D)
SET
Set Setpoint (control point)**
Set Low Temperature Limit**
Set High Temperature Limit**
Set Heat Proportional Band
(P = 0.1-99.9)
Set Heat Integral (I = 0-9.99)
Set Heat Derivative (D = 0-5.0)
Set On/Off Array
For example, to turn the unit on send CA 00 01 81 08 01 02 02 02 02 02 02 02(cs)
BATH ERROR RESPONSES
Bad Command
Bad Checksum
command bytes shown in bold
qb = qualifier byte, see Table 3
d1,d2 = 16 bit signed integer of the value being sent or received
cs = the checksum of the string (see text)
ed = echo back of the command byte as received
v1.v2 = protocol version
* See Read Status, Table 2
** limited to the range of the bath
MASTER SENDS
CA 00 01 00 00 FE
CA 00 01 09 00 F5
CA 00 01 20 00 DE
CA 00 01 21 00 DD
CA 00 01 70 00 8E
CA 00 01 40 00 BE
CA 00 01 60 00 9E
CA 00 01 72 00 8C
CA 00 01 73 00 8B
CA 00 01 F0 02(d1)(d2)(cs)
CA 00 01 C0 02(d1)(d2)(cs)
CA 00 01 E0 02(d1)(d2)(cs)
CA 00 01 F1 02(d1)(d2)(cs)
CA 00 01 F2 02(d1)(d2)(cs)
CA 00 01 F3 02(d1)(d2)(cs)
CA 00 01 81 08(d1)... (d8)(cs)
d1 = unit on/off, d2 = sensor enable, d3 = faults enabled, d4 = mute,
d5 = auto restart, d6 = 0.01°C enable, d7 = full range cool enable,
d8 = serial comm enable (di: 0 = off, 1 = on, 2 = no change)
N/A
N/A
B - 4
BATH RESPONDS
CA 00 01 00 02(v1)(v2)(cs)
CA 00 01 09 05(d1)(d2)(d3)(d4)(d5)(cs)
CA 00 01 20 03(qb)(d1)(d2)(cs)
CA 00 01 21 03(qb)(d1)(d2)(cs)
CA 00 01 70 03(qb)(d1)(d2)(cs)
CA 00 01 40 03(qb)(d1)(d2)(cs)
CA 00 01 60 03(qb)(d1)(d2)(cs)
CA 00 01 71 03(qb)(d1)(d2)(cs)
CA 00 01 72 03(qb)(d1)(d2)(cs)
CA 00 01 73 03(qb)(d1)(d2)(cs)
CA 00 01 F0 03(qb)(d1)(d2)(cs)
CA 00 01 C0 03(qb)(d1)(d2)(cs)
CA 00 01 E0 03(qb)(d1)(d2)(cs)
CA 00 01 F1 03(qb)(d1)(d2)(cs)
CA 00 01 F2 03(qb)(d1)(d2)(cs)
CA 00 01 F3 03(qb)(d1)(d2)(cs)
CA 00 01 81 08(d1)...(d8)(cs)
CA 00 01 0F 02 01(ed)(cs)
CA 00 01 0F 02 03(ed)(cs)