Martel Electronics MC-1000 Operating Manual

Using the Serial Communications Port on the MC-1000

1JPt100 (3926)

The MC-1000 calibrator is equipped with a DB-15 RS-232 serial
communications port, located on the top of the calibrator.

Not e: The user will require a special RS-232 cable to connect

the calibrator to a computer or terminal.

Communication

Once the cable is attached, set the communications program set­tings as follows:

Baud Rate = 9600
Data Bits = 8

Stop Bits = 1
Parity = None

Flow Control = Xon/Xoff

The MC-1000 calibrator can be used with virtually any terminal
emulation software. (i.e. Procomm or HyperTerminal).

Serial Communications Procedure
for HyperTerminal Program

1. From the Windows® desktop, click on “Start”.

2. Click on “All Programs”. Click on “Accessories.”

3. Under the category “Communications”, click on “Hyper
Terminal”.

4. Next appears a screen labeled: CONNECTION DESCRIP­TION. In the box titled: Name, enter a name for your program
settings... example: “MC Connection”. In a box titled: Icon,

click on the you want to use. Click on the OK box to accept
these entries.

5. Next appears a screen labeled: CONNECT TO. In the box
titled: Connect Using, select the serial port that corresponds to

the computer serial port that you’ll be using to communicate to
the MC-1000 calibrator. Click on the OK box to accept this

entry.

6. Next appears a screen labeled: COM X PROPERTIES (where
X corresponds to the serial port selected in step # 6). Enter port

settings as follows:

(A.) Bits per second: 9600
(B.) Data bits: 8

(C.) Parity: None
(D.) Stop Bits: 1

(E.) Flow Control: Xon/Xoff
Click OK box to accept these entries.

7. Hook up the MC-1000 calibrator to the PC utilizing the special
Martel Electronics RS-232 cable as follows:

(A.) Plug the 9 pin connector end of the cable to the

appropriate serial port on the computer.

(B.) With the MC-1000 calibrator switched off, plug the

other end of the cable to the DB-15 RS-232 port on
the top of the MC-1000 calibrator.

8. Power up the MC-1000 calibrator per the instruction manual.
You can now interact with the calibrator using the commands

shown in the table on the right.
Note: You may wish to save the communications settings when
exiting HyperTerminal. If so, click on the OK box when

prompted “Do you want to save X?”, where X corresponds to
the name entered in Step # 4.

® Microsoft, Windows, Windows NT, and MS-DOS are registered trademarks of
Microsoft Corporation. All other product names or services identified throughout
this manual are registered trademarks or trademarks of their respective companies.

Computer Controlled Operation

The MC-1000 calibrator can be operated remotely via a computer
or terminal. When connected to a computer, via the RS-232 serial

data port and appropriate cabling, the user may control the
calibrator functions remotely by utilizing simple computer
keyboard commands.

The following chart details which computer keys control which
MC-1000 calibrator functions:

Serial Input Description

A mA measurement
a mA source
I mA loop

i mA 2W Sim
V Volts measurement
v Volts source

M mV measurement
m mV source

E HVAC measure
e HVDC measure

K Khz measurement
k Khz source

H Hz measurement
h Hz source

P CPM measurement
p CPM source

W 2-wire measurement (Ohms and RTDs)
X 3-wire measurement (Ohms and RTDs)
Y 4-wire measurement (Ohms and RTDs)

T Thermocouple measurement (default Type

J) use "S" command to select sensor type

t Thermocouple source (default Type J) use

"S" command to select sensor type

C Selects Centigrade ( T/C - RTD )
F Selects Fahrenheit ( T/C - RTD )
R RTD measurement mode (default Pt 100

385) use "S" command to select sensor type

r RTD source mode (default Pt 100 385) use

"S" command to select sensor type

0-9 Enter a source value using ascii characters

-, <CR> 0,1,2,..,9,-,.terminated by < CR> (carriage
return)

D Single Broadcast of most recent display

value and units

d Single Broadcast of most recent display

value

"S" COMMANDS SELECT SENSOR TYPE

Serial Input Selection Entry Description
S No. Thermocouple Type RTD Type

2 K Pt100 (385)
3 T Pt100 (3916)
4 E Cu10
5 R Pt200 (385)

6 S Pt500 (385)
7 B Pt1000 (385)
8 L NI120
9 U YSI

A
B

N
mV

OHMS