ThermoFlex-Manual - 第125页

ThermoFlex D-1 Thermo Scientiﬁc Appendix D NC Serial Communications Protocol Note Appendix D assumes you ha ve a basic understanding of communications protocols .  Never apply line v olta ge to any of the connections. …

Thermo Scientiﬁc

C-8 ThermoFlex

Appendix C

Thermo Scientiﬁc

xx.x

Rdt H

rtd H

rtd L

rdt L

xx.x C

mode

rtd1

Flo

CAL

enter

mode

r rtd

A in

Aout1

StorE

PrES1

Remote Sensor Calibration

Figure C-6 Remote Sensor

Calibration Loop

This procedure requires a running chiller and a calibrated reference thermometer.

Note If it is more convenient, perform the low-end calibration before doing the

high-end.



Do not pick calibration points that are outside the safe operating limits of the uid

in your application. For example with water, 40°C and 5°C are typical high and low

calibration points.

Place the remote sensor and a calibrated reference thermometer in the high

temperature remote reservoir. Ensure the uid temperature is stabilized.

Press the

key and the controller will display rtd H. Press again and the

controller will ash between rtd H and the temperature.

Use the arrow keys to adjust the temperature to match the reference thermometer.

Press the

key again to accept the value.

Save calibration

Do not save calibration

Place the remote sensor and calibrated reference thermometer

in a low temperature reservoir. At the rtd L (low-end

calibration) display repeat the procedure.

After the low-end calibration is accepted StorE is displayed.

Press the up arrow to accept the calibration, press the down

arrow key to not accept it.

Note After pressing the up arrow button at the StorE

prompt wait several seconds before proceeding to ensure that

a bad calibration message (Er 16) does not appear. Premature

use of the keypad after pressing the up arrow may cancel the

bad calibration error message.



ThermoFlex D-1

Thermo Scientiﬁc

Appendix D NC Serial Communications Protocol

Note Appendix D assumes you have a basic understanding of communications protocols. 

Never apply line voltage to any of the connections. 

Connect your PC to the applicable connector on the rear of the chiller. Use the Setup Loop,

see Section 4, to enable serial communications.

Note Keypad operation is still available with serial communications enabled.



• SEr is used to enable/disable and to congure

serial communications.

Range:

oFF, rS232, rS485 Default: oFF

This display depends on your chiller

conﬁguration, see Section 4.

Figure D-1 Connectors

Figure D-2 Serial Communications Loop

BAud

StoP

dAtA

PAr

uid

----

SEr

enter

xxxx

enter

1 2 3 4 5

6 7 8 9

1 2 3 4 5

6 7 8 9

1 2 3 4 5

6 7 8 9

8 7 6 5 4 3 2 1

15 14 13 12 11 10 9

RS232 RS485

A I/O REMOTE

SENSOR

• BAud is used to select the baud rate (speed) for serial

communications.

Range: 9600, 4800, 2400, 1200, 600, or 300 bits per second

Default: 9600

• dAtA is used to display the number of data bits.

Range: Fixed at 8

• StoP is used to indicate the number of stop bits.

Range:

2 or 1 Default: 1

• PAr is used as a means to check for communication errors.

Range:

even, odd, or none Default: none

• u id (chiller id) is used in RS485 only. Identies devices

connected to the RS 485 port.

Range:

1 to 99 Default: 1

Note: To prevent data errors limit the number of chillers to 32.



WARNING

Thermo Scientiﬁc

D-2 ThermoFlex

Appendix D

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.