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Product Service: Domestic 1-800-522-7658, International 816-333-8811
Chapter 6: Modifying Your Freeze Dryer
Cable configuration for 9 pin male connector
(Labconco accessory cable part number 7534000)
The purpose of the RS232 interface is to send data to a
data collection computer to monitor the state and
activity of the freeze dryer. This data is half duplex
data. The data properties are as follows:
1. Data Rate 2400 Baud
2. 8 Bit word length
3. 1 Start bit, 1 Stop bit
4. No parity is transmitted
5. Standard ASCII character set
The format of the transmitted message is as follows:
COLLCTR=-48
– indicates the temperature of the collector in
degrees Celsius.
VAC=0018
– indicates the vacuum level of the system
in mBar x 10
-3
.
SHELL=-40 –
indicates the temperature of the shell freezer
bath
RFG=ON
– indicates the state of the collector refrigeration.
VAC=ON
– indicates the state of the vacuum pump.
PRG=OFF –
indicates the state of the purge valve.
SHL=ON
– indicates the state of the shell freezer.
DFRST = OFF
– indicates the state of the defrost
heater.
View from back of computer
1-DCD (Data Carrier Detect)
2-RX (Receive Data)
4-DTR (Data Terminal Ready)
5-GND (Signal Ground)
6-DSR (Data Set Ready)
7-RTS (Request to Send)
8-CTS (Clear to Send)
View from front of Labconco Freeze Dryer
1-TXD (Transmit Data)
4-AGND (Analog Ground)
BASE:<COLLCTR=-48 VAC=0018 SHELL=-40 RFG=ON VAC=ON PRG=OFF SHL=ON DFRST=OFF>
