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Installation and Wiring
2.3.5 Serial Port - RS232 or
RS485 (Option) -
fitted with a serial communication option, either
RS232 or RS485. The RS232 connection requires
a standard DB9 Female connector and connects to
an IBM PC compatible computer using a null
modem cable and can support cable runs up to 50
feet (16m). The RS485 connection is via two wire
(twisted pair) cable and can support cable runs up
to 4000 feet (1300m). The RS232 Connections to
the DB9 female connector are as follows:
Table 2-2 RS232 Connections
DB9
Connec-
Direction
Pin
tion
2
Rx Data
3
Tx Data
5
Common
Common
7
RTS
8
CTS
1 0 3 6 9 7 M A
Figure 2-11 RS232 Interface Option
A.
Connecting
Computer -
When connecting to a remote
computer, connect that computers RTS and CTS
lines together and connect only pins 2,3 and 5 from
the recorder. The recorder TxD line goes to the
computer RxD line, and the recorder RxD line goes
to the computer TxD line. The common is
2-8
The recorder may be
To
Modem
Comp-
pin
uter
(DB25)
(DB9)
In
3
Out
2
7
Out
NC
In
4,5
R S 232
2 - R xD
3 - Tx D
5 - Co m
7 - RTS
8 - CT S
RS232
to
Remote
connected at both ends. A null modem cable with
female connectors both ends can be used to
connect the recorder to an IBM compatible
Personal Computer. Connections to a modem are
shown in Table 2-2. Figure 2-11 shows the RS232
Interface option.
B. Connecting RS485 Terminal -
RS485 line connection has a positive (B) terminal
and a negative (A) terminal, with the red cable
going to the (A) terminal. This option has an
internal
terminating
connected to the line by switching either of the two
To
switches, above the connector, to ON. Refer to
Figure 2-12 for an example of the RS485 option.
3
2
1
5
2
8
7
O N
1 0 36 9 8 M A
Figure 2-12 RS485 Interface Option
Both switches must be OFF to disconnect
the resistor (default position).
Up to 31 recorders and or other RS485 compatible
devices may be connected to the line. Only the first
(usually the controller) and last units on the line
must have the terminating resistors switched in,
and then only for long cable lengths. The type of
cable used will limit the data rate and distance. For
this unit, 24 AWG polyethylene twisted telephone
cable that has a shunt capacitance of 16pF/ft
(52pF/m) will allow the full distance of 4000 feet
(1300m).
resistor
which
R S 485
1 2 0 O h m
Te rm in atio n
O F F
B (+ )
A (-)
NOTE
Siemens AG C79000-G7374-C211-01
SIREC D Manual
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