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Thermo Scientific D-2 ThermoFlex
Appendix D
Thermo Scientific Thermo Scientific
RS-232 COMM RS-485 COMM
Pin # Function Pin # Function
1 No connection 1-7 No connection
2 TX 8 T+
3 RX 9 T-
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
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 chiller's
standard female 9-pin connection.
Communication cables are available from Thermo Fisher. Contact us for additional
information.
5 4 3 2 1
9 8 7 6
All commands must be entered in the exact format shown in the tables on the following
pages. The tables show all commands available, their format and responses. Controller
responses are either the requested data or an error message. The controller response must
be received before the host sends the next command.
The host sends a command embedded in a single communications packet, then waits for
the controller’s response. If the command is not understood or the checksums do not
agree, the controller responds with an error command. Otherwise, the controller responds
with the requested data. If the controller fails to respond within 1 second, the host should
resend the command.