SERIES
9900
PIN
14 1 5 1 6 1 7 1 8 1 9
20 2 1 2 2
23 2 4 2 5
SIGNAL N A M E
PIN
SIGNAL N A M E
1
2
3
4
EARTH GROUND
TRANSMITTED D ATA ( T x )
RECEIVED D ATA ( R x )
REQUEST T O SEND
14
15
18
17
5
CLEAR T O SEND
18
6
DATA S E T READY
19
7
LOGIC GROUND
20
DATA TERMINAL READY
21
9
22
RING INDICATOR
10
23
11
2 4
12
25
13
9000
SERIES
GAUSSMETERS
SECTION V I
V
I
-A R S -232 PORT FUNCTION DESCRIPTION
COMMUNICATIONS
INTERFACE
The gaussmeter, like most terminals, printers and computers, is considered a
DTE (Data Terminal Equipment). A modem is a DCE (Data Communications
Equipment). The SERIES-9900 gaussmeter's RS-232 port is implemented
on a standard 25-pin female "D" connector. Only 9 of the 25 pins are actually
used, as shown in figure VI-A.
1 2 3 4 5 6 7 8 9 1 0 1 1 1 2 1 3
Pin-1: Earth Ground
Figure VI-A
RS-232 "D" Connector
This line connects to the gaussmeter
chassis which is connected to the center
terminal of the line cord power receptacle.
The use of this pin is optional and is normally
tied to the shield of a shielded multicon-
ductor cable to minimize RFI/EMI radiation
problems. DO NOT CONNECT THIS EARTH
GROUND TO THE COMMON RETURN LINE
(Pin-7)!
Pin-2: Transmit Data (TX) T h i s line carries serial data
from
the
gaussmeter
to
the host DIE.
Pin-3: Receive Data (RX) T h i s line carries serial data
to
the gaussmeter
from
the host DIE.
Pin-4: Rea,uest to Send (RTS) T h e gaussmeter asserts this line to indicate
that it can accept data from the host DTE.
Pin-5: Clear to Send (CTS) T h e host DTE asserts this line to indicate
that it can accept data from the gaussmeter.
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