SMC Networks THERMO-CON HEC001 Series, Communications Manual, Page: 18 / 25

Details of Communication Format
HEC 4-4
<Specifying unit>
Host
→
SOH UT ENQ 34H Check sum CR
(
Ｈ
) (
Ｌ
)
←
Thermo-con
SOH UT STX 34H Data ETX Check sum CR
D1 D2 D3 (
Ｈ
) (
Ｌ
)
Host
→
ACK UT CR (Possible to omit)
Data (D2, D2, D3) changes following bit line to ASCII code. (1 is for ON, 0 is for OFF)
D1 2
3
2
2
2
1
2
0
High temp. cut off alarm ERR12
Low temp. cut off alarm ERR13
Unused
Output failure alarm ERR15
D2 2
3
2
2
2
1
2
0
Upper temperature limit alarm WRN
Lower temperature limit alarm WRN
Thermostat alarm ERR14
DC power supply failure alarm ERR11
D3 2
3
2
2
2
1
2
0
External sensor failure alarm ERR18
Internal sensor failure alarm ERR17
During Auto tuning or auto tuning warning ERR19
Flow switch alarm ERR16 or level switch alarm ERR20
When some alarms/warnings go off at the same time, D1 to D3 reaches the added value.
Ex.
When the “Upper temperature limit alarm” and the “DC power voltage alarm” go off simultaneously,
D2 will be 2
3
X1+2
2
X0+2
1
X0+2
0
X1=9(=39H).