26 DF-745SG
Connecting to External Devices
See the chapter on Communications on page 62 for additional information on
setting unit ID’s and baud rates.
A program to facilitate serial communications is available from Servomex.
Pin #
Signal
Description
J5-8
GND
Ground
J5-7
TX-
4 wired 485 paired with TX+
J5-6
Key
Unused
J5-5
RX-
4 wire 485 paired with RX+
J5-4
Unused
J5-3
Unused
J5-2
TX+
Data transmitted by the analyzer via RS-232 or RS-485
J5-1
RX+
Data received by the analyzer via RS-232 or RS-485
Table 1: Pin-out of Serial Comm Connector J5
Pin assignments
DF-745SG
Connector J5
PC-DB9/RS-232
PC-DB25/RS-232
PC/RS-485
converter
1
: RX+
3
: TD
2
: TD
TX+
2
: TX+
2
: RD
3
: RD
RX+
8
: Gnd
5
: Gnd
7
: Gnd
5:
RX-
TX-
7:
TX-
RX-
Table 2: Serial Communications Connections
6.2 Analog Signal Outputs – J4
The analog voltage output correlating to the front panel display reading is
provided on the rear of the analyzer through connector J4. The full scale voltage is
set at the factory at the time of order to: 0 to 1 VDC, 0 to 2 VDC, 0 to 5 VDC, or
0 to 10 VDC. The output is electrically isolated from all other analyzer outputs,
and from chassis (Earth) ground. See page 52 for additional information on setting
the Analog Output. The output may be tested with the use of the analog voltage
test routine found on page 58.
6.3 4-20 mA Outputs – J4
The 4-20 mA analog output correlating to the front panel display reading is
provided on the rear of the analyzer through connector J4. This output is
electrically isolated from all other analyzer outputs, and from chassis (Earth)
ground.
The maximum load resistance for each is 1K Ohms and the analyzer provides a
compliance voltage of approximately 28 VDC.
Содержание NanoTrace DF-745SG
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