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4.5 PAXI SERIAL COMMUNICATION WIRING
RS232 Communications
RS485 Communications
PAX METER (DTE)
12
TXD
RXD
RECEIVING DEVICE
DB25 DB25 DB9
DCE DTE DTE
2 3 2
The RS485 communication standard allows the connection of up to 32
devices on a single pair of wires, distances up to 4,000 ft. and data rates as high
as 10M baud (the PAX is limited to 19.2k baud). The same pair of wires is used
to both transmit and receive data. RS485 is therefore always half-duplex, that
is, data cannot be received and transmitted simultaneously.
13
RXD
TXD
3
2
3
14
COMM.
5
7
5
PAX METER
+ 5V
RECEIVING DEVICE
15 NC
Terminal Block Connection Figure
Transmit
Enable
33K
12
B ( - )
13
A (+)
9
5
33K
6
1
PIN 2 TXD
PIN 3 RXD
14
COMM. *
PIN 5 COMMON
FEMALE
Extended Comms Connection Figure
RS232 is intended to allow two devices to communicate over distances up to
50 feet. Data Terminal Equipment (DTE) transmits data on the Transmitted Data
(TXD) line and receives data on the Received Data (RXD) line. Data Computer
Equipment (DCE) receives data on the TXD line and transmits data on the RXD
line. The PAX emulates a DTE. If the other device connected to the meter also
15 NC
* OPTIONAL
Terminal Block Connection Figure
emulates a DTE, the TXD and RXD lines must be interchanged for
communications to take place. This is known as a null modem connection. Most
2
3
4
5
printers emulate a DCE device while most computers emulate a DTE device.
Some devices cannot accept more than two or three characters in succession
without a pause in between. In these cases, the meter employs a busy function.
As the meter begins to transmit data, the RXD line (RS232) is monitored to
determine if the receiving device is “busy”. The receiving device asserts that it
is busy by setting the RXD line to a space condition (logic 0). The meter then
suspends transmission until the RXD line is released by the receiving device.
4.6 PAXI ANALOG OUTPUT WIRING
ANALOG OPTION CARD FIELD TERMINALS
PAX CONNECTOR
Extended Comms Connection Figure
4.7 PAXI PRESCALER OUTPUT WIRING
16 +
17 -
18 +
19 -
0-10V
ANALOG
OUTPUT
0-20mA
ANALOG
OUTPUT
5.0 R EVIEWING
THE
F RONT B UTTONS
AND
D ISPLAY
Counter
Readout
Legends*
A
B
C
SP1 SP3 SP4 SP2
8.8.8.8.8.8
Setpoint Alarm
Annunciators
DSP
PAR
F1
F2
RST
KEY
DSP
PAR
F1 ?
F2 ?
RST
DISPLAY MODE OPERATION
Index display through the selected displays.
Access Programming Mode
Function key 1; hold for 3 seconds for Second Function 1 **
Function key 2; hold for 3 seconds for Second Function 2 **
Reset (Function key) ***
PROGRAMMING MODE OPERATION
Quit programming and return to Display Mode
Store selected parameter and index to next parameter
Increment selected parameter value or selections
Decrement selected parameter value or selections
Advances digit location in parameter values
* Counters B, and C are locked out in Factory Settings (PAXC and PAXI only).
** Factory setting for the F1, and F2 keys is NO mode.
*** Factory setting for the RST key is ?????? (Reset Display).
11
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