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K400 Issue No. 1 43
4 SERIAL COMMUNICATION
Using the standard digital RS232 interface, the calibrator can be controlled from a
remote computer. By sending commands via the RS232 interface, the calibrator
automatically retrieves temperature readings or modifies any parameter settings
(temperature set-point, temperature reference selection, ramp/step/preset
generation etc.).
4.1 DBC Series - Serial Commands Protocol
ABBREVIATIONS:
aa:
Two digit DBC address in ASCII format. (i.e.. 01).
Send 00 to overwrite every other address.
par:
Parameter. Command depending format.
R/W:
Read and Write command
R:
Read Only command
n.a.:
Not Applicable
[ ]:
Every parameter enclosed in square bracket are optional
Command
Flow
Command Parameters Description
Model
(TS/TC)
Write
Read
Query
*aaEM=par
*aaEM?
!aaEM=par
Par = 0 Absolute error °C
1% of span
2% of readings
R/W - Error Computation Mode
(MM command to set CAL mode)
TC
TC
TC
Write
Read
Query
n.a.
*aaER?
!aaER=par
Par = floating point R – Get Error Value
(Mode selected by EM command)
TC
Write
Read
Query
*aaICc=par
*aaICc?
!aaICc=par
c =1 Regulator (optional)
2 Measure
par = 0 NONE
1 n.a.
2 T/C +CJ
3 T/C no CJ
4 RTD 3 Wires
5 RTD 4 Wires
6 RES 3 Wires
7 RES 4 Wires
8 mV
9 n.a.
10 n.a.
11 n.a.
12 mA
13 n.a.
14 Switch
15 n.a.
16 n.a.
17 Reference RTD 4 wires
18 V
R/W –Input Channel
No measure
Thermocouple + Cold Junction
Thermocouple without Cold Junct.
Thermoresistors 3 wires
Thermoresistors 4 wires
Resistors up to 400 Ω 3 wires
Resistors up to 400 Ω 4 wires
mV input
mA input
Switch mode
User Thermoresistors 4 wires
Volt Input
TS
TC
TS
TC
TC
TS/TC
TS/TC
TC
TC
TC
TC
TS/TC
TS/TC
TS/TC
TC