Thermo Scientific ThermoFlex Manual De Instrucciones página 180

NC Serial Communications Protocol
Appendix C
Note Appendix C assumes you have a basic understanding of communications protocols.
RS232 RS485
Connect your PC to the applicable connector on the rear of the chiller. Use the controller,
see Section 4, to enable serial communications.
A I/O REMOTE Note Keypad operation is still available with serial communications enabled.
SENSOR
Figure C-1 Connectors
All data is sent and received in binary form, do not use ASCII. In the following pages the binary data is
represented in hexadecimal (hex) format.
The NC Serial Communications Protocol is based on a master-slave model. The master is a host computer, while
the slave is the chiller's controller. Only the master can initiate a communications transaction (half-duplex). The
slave ends the transaction by responding to the master's query. The protocol uses RS-232/RS-485 serial interface
with the default parameters: 9600 baud, 8 data bits, 1 stop bit, and no parity. RS-485 offers a slave address
selection, default parameter: 1.
The chiller can be controlled through your computer's serial port by using the
connection.
Communication cables are available from Thermo Fisher. Contact us for additional information.
Thermo Scientific
Never apply line voltage to any of the connections.
WARNING
RS-232 COMM
Pin # Function
1 No connection
2 TX
3 RX
4 No connection
5 GND = Signal ground
6 - 9 No connection
TX = Transmitted data from controller
RX = Received data to controller.
Hardware Mating Connector
AMP Part# 745492-2 or equivalent
chiller's standard female 9-pin
RS-485 COMM
Pin # Function
1-7 No connection
8 T+
9 T-
5 4 3 2 1
9 8 7 6



ThermoFlex C-1