DayTronic 5D78 Руководство по эксплуатации - Страница 19
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2.
S
B
ERIAL
As shown in Fig. 7, simple two-wire RS232 cabling is
employed for communications between the 3000PLUS
and an external PC. While 3000PLUS / PC serial com-
munications will usually take place through the 3KP
Configurator software described in Section 4, a "termi-
nal emulation" program (either conventional or cus-
tomized) can also be used to issue standard mnemonic
commands to the meter, and to receive meter respons-
es.
The RS232 interface observes a fixed protocol of
19,200 baud, 8 data bits, 1 stop bit, and NO parity—with
no software or hardware "handshake." The Configura-
PC for
Configuration /
Data Acquisition
RECEIVE
TRANSMIT
COMMON
3000PLUS
C
OMMUNICATIONS
COM
PORT
SHIELD
5D78 I
WITH
NSTRUCTION
2. C
ONNECTIONS
C
ONNECTIONS
tor software will automatically set to this protocol the
computer COM PORT selected for communications
with the 3000PLUS (see "Setup and Testing of Serial
Communications" in the Configurator's on-line HELP
system).
Separate shielding of the RECEIVE and TRANSMIT lines
is highly recommended, especially if the cable connect-
ing the PC and the 3000PLUS is over three feet in
length. This will prevent electrical noise from causing
"break" signals and other communications errors.
Fig. 7
RS232 Interface Connections
M
. SB.3
ANUAL V
3KP78 - 2.2