78
This configuration does not provide the isolation that may be required at the computer or
printer interface. Table 9 explains the function of each of the individual jumper closures.
Table 11 Current Loop Customer Connection Box
Post No.
Description
Function
7
Current loop in (+)
Data input loop, positive
8
Current loop in (-)
Data input loop, negative
9
Current loop out (+)
Data output loop, positive
10
Current loop out (-)
Data output loop, negative
Table 12 RS-232C Cable Configuration
pH/ORP Meter
TB1Connection
Host Computer/Printer
Connection
TB1-3 (TXD)
(RXD)
TB1-2 (RXD)
(TXD)
TB1-1 (COM)
(COM)
(RTS) to (CTS)*
* If the lines can be disabled through hardware or software, then
this jumper is not needed.
(DSR) to (DTR)*
Table 13 RS-232C Line Signal Definitions
Signal Name
Description
TXD
Transmitted Serial Data (Output)
RXD
Received Serial Data (Input)
RTS
Request To Send (Output). This signal requests permission to transmit data.
Hardware handshaking uses this signal.
CTS
Clear To Send (Input). This signal indicates the equipment is ready to receive
data. Hardware handshaking uses this signal.
DSR
Data Set Ready (Input). This signal indicates that the remote equipment has a
data block ready to transmit. Hardware handshaking uses this signal.
DTR
Data Terminal Ready (Output). This signal indicates that the equipment has a
data block ready to transmit. Hardware handshaking uses this signal.
COM
Signal Ground (Common Return)
SHLD
Protective Ground used for shielding
Содержание EC1000
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Страница 61: ...61 Figure 15 Installing the pH ORP Electrode Figure 16 Flow Thru Cell...
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