Buffer Memory

To write to buffer memory, use the TO instruction.

To read from buffer memory, use the FROM instruction.

Please refer to the table below for writing to and reading from buffer memory.

Memory Address (Hexadecimal)	Memory Address (Decimal)	Details	Read	Write
00H	0	TC conversion Enable/Disable	✓	✓
01H	1	Channel 1 Temperature detection value (°C)	✓	–
02H	2	Channel 2 Temperature detection value (°C)	✓	–
03H	3	Channel 3 Temperature detection value (°C)	✓	–
04H	4	Channel 4 Temperature detection value (°C)	✓	–
05H	5	Reserved	–	–
06H	6	Reserved	–	–
07H	7	Reserved	–	–
08H	8	Reserved	–	–
09H	9	Channel 1 ~ Channel 4 Thermocouple type setting	✓	✓
0AH	10	Digital output setting 1	✓	✓
0BH	11	Channel 1 Temperature detection value (°F)	✓	–
0CH	12	Channel 2 Temperature detection value (°F)	✓	–
0DH	13	Channel 3 Temperature detection value (°F)	✓	–
0EH	14	Channel 4 Temperature detection value (°F)	✓	–
0FH	15	Reserved	–	–
10H	16	Reserved	–	–
11H	17	Reserved	–	–
12H	18	Reserved	–	–
13H	19	Information for operation channel	✓	–
14H	20	Assigning type setup data	✓	✓
15H	21	Channel 1 Digital conversion value	✓	–
16H	22	Channel 2 Digital conversion value	✓	–
17H	23	Channel 3 Digital conversion value	✓	–
18H	24	Channel 4 Digital conversion value	✓	–
19H	25	Reserved	–	–
1AH	26	Reserved	–	–
1BH	27	Reserved	–	–
1CH	28	Reserved	–	–
1DH	29	Digital output setting 2	✓	✓
1EH	30	Designate Average Process	✓	✓
1FH	31	Channel 1 Error code	✓	–
20H	32	Channel 2 Error code	✓	–
21H	33	Channel 3 Error code	✓	–
22H	34	Channel 4 Error code	✓	–
23H	35	Reserved	–	–
24H	36	Reserved	–	–
25H	37	Reserved	–	–
26H	38	Reserved	–	–
27H	39	Reserved	–	–
28H	40	Requesting data for calibration	✓	✓
29H	41	Channel 1 Maximum temperature input value	✓	✓
2AH	42	Channel 2 Maximum temperature input value	✓	✓
2BH	43	Channel 3 Maximum temperature input value	✓	✓
2CH	44	Channel 4 Maximum temperature input value	✓	✓
2DH	45	Reserved	–	–
2EH	46	Reserved	–	–
2FH	47	Reserved	–	–
30H	48	Reserved	–	–
31H	49	Assigning temperature setting data	✓	✓
32H	50	Assigning temperature setting data	✓	–
33H	51	Channel 1 Minimum temperature input value	✓	✓
34H	52	Channel 2 Minimum temperature input value	✓	✓
35H	53	Channel 3 Minimum temperature input value	✓	✓
36H	54	Channel 4 Minimum temperature input value	✓	✓
37H	55	Reserved	–	–
38H	56	Reserved	–	–
39H	57	Reserved	–	–
3AH	58	Reserved	–	–
3BH	59	Channel 1 Average time/filter coefficient setting	✓	✓
3CH	60	Channel 2 Average time/filter coefficient setting	✓	✓
3DH	61	Channel 3 Average time/filter coefficient setting	✓	✓
3EH	62	Channel 4 Average time/filter coefficient setting	✓	✓
3FH	63	Operating System Version	✓	–
40H	64	Channel 1 Maximum temperature in changing	✓	✓
41H	65	Channel 2 Maximum temperature in changing	✓	✓
42H	66	Channel 3 Maximum temperature in changing	✓	✓
43H	67	Channel 4 Maximum temperature in changing	✓	✓
44H	68	Reserved	–	–
45H	69	Reserved	–	–
46H	70	Reserved	–	–
47H	71	Reserved	–	–

Thermocouple Conversion Enable/Disable

• Setup TC conversion enable or disable for each channel.
• The initial value is thermocouple conversion disable.
• In order to save the set value to the TC module, Requesting to save set value (Yn.2) must be ON/OFF.
• The set value is stored in EEPROM and is operated by the previous set value when the power is turned ON/OFF.

BIT 15	BIT 14	BIT 13	BIT 12	BIT 11	BIT 10	BIT 9	BIT 8	BIT 7	BIT 6	BIT 5	BIT 4	BIT 3	BIT 2	BIT 1	BIT 0
0	0	0	0	0	0	0	0	0	0	0	0	CH4	CH3	CH2	CH1

• Bit 4 ~ Bit 15 are fixed to 0 by default.
• Channel 1 ~ 4 (bits 0 ~ 3) have TC conversion disabled if the bit is 0.
• Channel 1 ~ 4 (bits 0 ~ 3) have TC conversion enabled if the bit is 1.

Temperature Detection Value (°C)

• The temperature detection value stores the temperature value detected by TC conversion.
• The value stored in the memory is the actual temperature (first decimal digit × 10).
• The following are the temperature ranges for each thermocouple:

Thermocouple Temperature Ranges

Thermocouple	Measured Temperature Range (°C)	Maximum Range of Measured Temperature (°C)
K	-200°C ~ 1,200°C	-250°C ~ 1,250°C
J	-200°C ~ 800°C	-250°C ~ 850°C
E	-200°C ~ 600°C	-250°C ~ 650°C
T	-200°C ~ 400°C	-250°C ~ 450°C
B	-400°C ~ 1,800°C	-350°C ~ 1,850°C
R	0°C ~ 1,750°C	-50°C ~ 1,800°C
S	0°C ~ 1,750°C	-50°C ~ 1,800°C
N	-200°C ~ 1,250°C	-250°C ~ 1,300°C

• If the value is out of range, it is measured by the minimum -50°C and the maximum 50°C.

Thermocouple Type Setting

• In order to make the TC type available, set the bit for assigning type setup data (Buffer Memory Address 20 (14H)) to 1 and the Requesting to save set value (Yn.2) is ON/OFF.
• The initial value is set to K type.
• The set value stored in EEPROM and is operated by the previous set value when the power is turned ON/OFF.

TC Type	K	J	E	T	R	S	B	N
Set Value	0	1	2	3	4	5	6	7

Bit 15 ~ Bit 4	Bit 3	Bit 2	Bit 1	Bit 0
Buffer Memory Address 9 (09H)	Channel 4	Channel 3	Channel 2	Channel 1

Temperature Detection Value (°F)

• The temperature detection value stores the temperature value detected by TC conversion..
  • The temperature, in Fahrenheit, converted by the TC module is stored.
  • The actual temperature (the first decimal digit × 10) is stored into memory.

Information for Operation Channel

• The information for a channel under normal conversion among conversion-enabled channels is displayed.
• The bit for disconnected channel among conversion-enabled channels is 0 while the bit for channels under normal conversion is 1.
• The bit for conversion-disabled channels store 0.

Digital Conversion Value

• The temperature measured by the TC module is stored as a digital value:
  • The minimum digital value is 0 (-8,000).
  • The maximum digital value is 16,000 (8,000).
• If the temperature is out of range, it is stored as -192 (-8,192) or 16,191 (8,191).
• If the user input minimum and maximum values:
  • If the minimum temperature is measured, 0 (-8,000) is stored.
  • If the maximum temperature is measured, 16,000 (8,000) is stored.

Digital Output Setting

• Select the following ranges as a digital output value:
  • 0 ~ 16,000
  • -8,000 ~ 8,000
  • -192 ~ 16,191
  • -8,192 ~ 8,191
• If the range -192 ~ 16,191 or -8,192 ~ 8,191 is selected, the TC module displays the minimum and maximum measured temperature for each thermocouple by 0 ~ 16,000 or -8,000 ~ 8,000.
  • If the input value exceeds either range, the TC module displays -192 ~ 16,191 or -8,192 ~ 8,191.
• The initial value is set to -192 ~ 16,191.
• In order to save the set value to the TC module, Requesting to save set value (Yn.2) must be ON/OFF.
• The set value is stored in EEPROM and is operated by the previous set value when the power is turned ON/OFF.

Bit Mapping

BIT 15	BIT 14	BIT 13	BIT 12	BIT 11	BIT 10	BIT 9	BIT 8	BIT 7	BIT 6	BIT 5	BIT 4	BIT 3	BIT 2	BIT 1	BIT 0
0	0	0	0	0	0	0	0	0	0	0	0	CH4	CH3	CH2	CH1

Buffer Memory 10 (0AH)	Buffer Memory 29 (1DH)	Digital Output Type
0	0	-192 ~ 16,191
0	1	-8,192 ~ 8,191
1	0	0 ~ 16,000
1	1	-8,000 ~ 8,000

Designate Average Process

• Set the average process of the TC module to enable/disable.
• The initial value for the average process of all channels is disabled.
• In order to save the set value to the TC module, Requesting to save set value (Yn.2) must be ON/OFF
• The set value is stored in EEPROM and is operated by the previous set value when the power is turned ON/OFF.

Error Code

• The error code detected by the TC module is stored
• The error is maintained before it is cleared or the power is turned OFF.
  • If another error occurs before the previous error is not cleared, the newly generated error is ignored.
• The error code is a decimal number.

Error Code:

Value	Description
01	Disconnection
02	If the NTC temperature exceeds its range.
04	If the measured value exceeds the minimum or maximum range
100	System error (Contact Maple Systems)

Minimum and Maximum Temperature Input Value

• In order for the minimum or maximum set value to be effective, make sure the corresponding bit for temperature set data (Buffer Memory Address 49 (31H)) is set to 1 and the Requesting to save set value (Yn.2) is ON/OFF.
• For the minimum and maximum setting, if the minimum value input by the user is larger than the maximum value, the bit for the corresponding channel becomes 1.
• The set value stored in EEPROM and is operated by the previous set value when the power is turned ON/OFF.
• If the maximum value is smaller than the minimum value, an error occurs.

Average Time/Filter Coefficient Setting

• The average time/filter coefficient setting stores the set filter coefficient value, and the average time set value.
• The average time set value for 1 BYTE (lower WORD) is 1 ~ 255 seconds.
• The filter coefficient set value for 1 BYTE (upper WORD) is 0% ~ 70%.
• When the filter function is not used, the value is 0.
  

Average Time/Filter Coefficient Setting Example

• Example: if the average time for channel 1 is 2 seconds amd the filter coefficient is 50:
  • H3202 (12,802) is stored into the buffer memory address 59 (3BH).

BIT 15	BIT 14	BIT 13	BIT 12	BIT 11	BIT 10	BIT 9	BIT 8	BIT 7	BIT 6	BIT 5	BIT 4	BIT 3	BIT 2	BIT 1	BIT 0	Value
0	0	1	1	0	0	1	0	0	0	0	0	0	0	1	0	H3202 12,802

• If the converted temperature has severe variations due to external noise, follow below:
  • The width for variations for the converted temperature is limited before it is stored in buffer memory.
  • The range of the setting value is 0% ~ 70%.

Example: If the temperature changes as shown in the table below: it is a value that is stored in buffer memory.

Conversion temperature value Digital filter value	10	15	13	9	14	12	9	5	15
10%	–	14.5	13.2	9.4	13.5	12.2	9.3	5.4	14.0
70%	–	11.5	12.0	11.1	12.0	12.0	11.1	9.3	11.0

Current value = current value + (previous value – current value) × filter coefficient (%) ÷ 100

Operating System Version

• The operating system version indicates the firmware version of the module.

Maximum Temperature in Changing

• The maximum temperature in changing sets the difference between the previous measurement and the current measurement for each channel and stores the difference.
• The range is 3 ~ 1,000.
  • The initial value is 10.
• A low set value may cause a slow response, but high stability.
• A high set value may cause a rapid response, but low stability.
• If the temperature is not updated under rapidly changing temperature conditions, use a higher temperature than the current set value.