SPX HPD Series, Instruction Manual

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Cable Pin Out:
- Data transmitted on pin 2
- Data received on pin 3
- Ground is pin 5
- Pins 7 and 8 are jumpered at the dryer
Operation:
1. Fixed baud rate of 9600
2. Asynchronous format is 8 bit, no parity, 1 stop bit
(“8,N,1”)
3. No check sum or error correction values are pro-
vided. If required, request status string two (or more)
times and compare for agreement.
4. Request data by sending ASCII ? character (3FH).
Response may take up to two seconds as certain
processing functions may require completion before
the serial port is acknowledged.
5. The dryer responds with line feed (0AH), carriage
return (0DH), and a character string as follows:
STX Start of text character 0x02
109 Three character ASCII device identifier
, comma character
x ASCII representation of the cycle type
,
xx ASCII representation of the cycle step
,
xxxxx ASCII representation of the current cycle time
in seconds
,
xxx ASCII representation of the inlet temperature
(°F)
,
xxx ASCII representation of the heater temperature
(°F)
,
xxx ASCII representation of the left bed
temperature (°F)
,
xxx ASCII representation of the right bed
temperature (°F)
,
xxx ASCII representation of the humidity sensor
temperature (°F)
,
xxx ASCII representation of the humidity sensor
relative humidity (%)
,
xxxx ASCII representation of the dew point reading
(°F)
,
xxxx ASCII representation of the filter time to
service (hours)
,
xxxx ASCII representation of the desiccant time to
service (hours)
,
xxxx ASCII representation of the valve time to
service (hours)
,
x ASCII representation of programming
jumpers
,
1 or 0 Is the unit alarmed? 1 = alarm
,
1 or 0 Is service required? 1 = service
,
xx ASCII representation of the energy savings
(%)
,
x Reserved for future use, always 1 for now
,
ETX end of text character OxO3
CR carriage return
LF line feed
JUMPERS:
The programming jumpers are as follows (0=off,
1=on):
JP Bit
1 0 off = externally heated on = blower dryer
2 1 on = energy management sensor installed
3 2 on = dew point sensor installed
4 3 on = no cooling (blower purge only)
5 4 on = tower pressure switches installed
6 5 on = not used (fast cycle for development,
V3.5 and prior)
7 6 on = to download language text (factory
use)
8 7 on = to enable factory set-up screens
Determining jumper positions:
Each jumper 8 bits weighted by position
JP Value
8 128
7 64
6 32
5 16
4 8
3 4
2 2
1 1
Example:
If jumper 8, 5, and 1 are installed, a value of 128+16+1
= 145 is returned
To decode, the algorithm:
· If (number >= 128)
è
jumper 8 = on
· number = number - 128
· If (number >= 64)
è
jumper = on
· number = number - 64;
· etc.....