PD8-6300 Pulse Input Rate/Totalizer, Counter & Tachometer
Instruction Manual
29
RS-485 Connections
The RS-485 connections are made to a five terminal
connector used for Modbus
®
RTU serial
communications. The RS-485 terminals include
Transmit Data (DO) and (/DO), Receive Data (DI) and
(/DI), and Signal Ground. See
) on page
information.
There are three diagnostic LEDs: Transmit Data (TX),
Receive Data (RX) and METER LINK to show when
the meter is transmitting and receiving data from other
devices.
Figure 18. RS-485 Diagnostic LEDs
RS-485 Multi-Drop Connection
When using more than one meter in a multi-drop
mode, each meter must be provided with its own
unique address. The meter address (Slave ID) can be
programmed between 1 and 247. The transmit delay
can be set between 0 and 199 ms. The parity can be
set to even, odd, or none with 1 or 2 stop bits.
To change the meter address:
1. Press and hold the Menu button for three
seconds to access Advanced Features menu of
the meter.
2. Press Up arrow until Serial (
SEriaL
) menu is
displayed and press Enter,
Addres
is displayed.
3. Press Enter to change meter address using Right
and Up arrow buttons. Press Enter to accept.
4. Press Menu button to exit and return to Run
Mode.
Three-Wire Connection
In order to wire the five pins for use as a three-wire
half-duplex RS-485 connection, it is necessary to
create a jumper connection between DI to DO and /DI
to /DO- as shown below.
Figure 19. Three-Wire RS-485 Connection
Digital I/O Connections
The ProtEX-MAX has a 10-position terminal block for
connecting digital inputs and outputs.
Figure 20. Digital Input and Output Connections
The onboard digital inputs (1-4) are configured at the
factory to function identically to the front panel
pushbuttons (Menu, F1, F2, & F3) in order to work
with the SafeTouch buttons. Changing the
programming of the digital inputs will affect the
function of the SafeTouch buttons.
If you wish to change the behavior of the digital
inputs, re-assign F1-F3 to the desired function, then
change the corresponding digital input to match.
•
DO NOT
disconnect the RJ45 M-LINK connector
cable. Otherwise the instrument will not function
properly.
F4 Digital Input Connections
A digital input, F4, is standard on the meter. This
digital input should be connected with a normally
open contact across F4 and COM, or with an active
low signal applied to F4. It can be used to reset the
total, for remote operation of front-panel buttons, to
acknowledge/reset relays, or to reset max/min values.
See
Function Keys & Digital I/O Available Settings
for a complete list of capabilities.
Figure 21. F4 Digital Input Connections
__ __
DI
DI DO DO
1
2
3
4
5
6
+5
I1
I2
I3
I4
O1
7
8
O2
O3
9
10
O4
G
DI 1-4
DO 1-4
5 VDC
GND
P-
COM
P+
S+
S-
3
4
1
2
5
F4
6
Summary of Contents for ProtEX-MAX PD8-6300
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