7
Dryer responds with line feed (0AH), carriage return
(0DH), and character string:
(1), (2), (3), (4), (5), (6), (7), (8), (9)
(1) = STX (start-of-text character, may appear as a
smiley face or some other character
(2) = 108, Control board ID
(3) = 0 or 1, Compressor running status (0=off, 1=on)
(4) = M or S, Operating Mode (M= MANUAL OVERRIDE,
S = SCHEDULE RUNNING)
(5) = xxxx, HOURS TO SERVICE
(6) = xxxxxx, TOTAL HOURS
(7) = xx, Alarm or Service Code (0=no alarm, 30=LOW
PRESSURE ALARM, 31=HIGH PRESSURE ALARM,
32=COMPRESSOR ALARM, 36=HIGH EVAP TEMP
ALARM, 37=HEATER ALARM, 38=DRAIN ALARM,
39=SERVICE DRYER, 41=TEMP SENSOR ALARM)
(8) = xx.x, Evaporator temperature (°F)
(9) = ETX, (end-of-text character, may appear as a heart
or some other character)
d. Check Temperature indicator - indicator should read
in the green area.
e. Check Alarm/Service light If illuminated, check
Interface panel.
1) If SERVICE DRYER appears, scheduled
maintenance time has elapsed (HRS TO
SERVICE is 0). Perform needed service and
reset service interval (see B.3.).
2) If ALARM appears, a dryer fault is indicated; see
Troubleshooting Guide for possible remedies.
After fault correction push Reset button to turn
Fault alarm off.
Type of FAULTS:
LOW PRESSURE - the refrigeration compressor
control circuit has opened because of low suction
pressure.
HIGH PRESSURE - the refrigeration compressor
control circuit has opened because of high head
pressure. The high pressure switch must be
reset manually once the fault is corrected. Red
reset button is located on pressure switch inside
unit.
HIGH TEMPERATURE - compressed air
temperature is above the set point.
COMPRESSOR - Normally open (NO) auxiliary
contact on the compressor contactor is open
when the dryer is on.
HEATER - Normally closed (NC) auxiliary contact
on the compressor contactor is open when the
dryer is off.
TEMP SENSOR - Occurs if the temperature
sensor circuit is open or shorted. If open, the
left-most LED in the temperature display will be
illuminated. If shorted, all the LEDs in the
temperature display will be illuminated.
DRAIN - electric drain contains a high water level
alarm that activates if drain fails to discharge.
f. Check drain operation - push Drain (push-to-test)
button to energize electric drain. A flow of
condensate and/or air should be present at the drain
outlet.
E. Using the RS-232 port
The RS-232 port is used to monitor dryer operation from a
host computer. A (1 to 1) DB-9 cable is required to
connect dryer and computer. For PC connections, data is
transmitted on pin 2, received on pin 3, ground is pin 5,
pins 7 and 8 are jumpered at dryer.
Operation is at fixed baud rate of 9,600; asynchronous
format is 8 bit, no parity, 1 stop bit (“8,N,1”). No check
sum or error correction values are provided. If required,
request status string two (or more) times and compare for
agreement.
Request data by sending ASCII ? character (3FH).
Response may take up to two seconds as certain pro-
cessing functions may require completion before serial
port is acknowledged.
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