Red Lion LEGEND User Manual
Page 35
The various Print Options are used with a printer or a Computer Terminal.
They provide a choice of which Legend data values are to be printed, when
either the User Input, programmed for the print request function is activated,
or a “P” (Transmit Print Options) command is sent to the Legend via the serial
port. The Print Options are programmed in the “Program Print Options”
module, the available options are:
A. Print Rate Value.
B. Print Peak Value.
C. Print Valley Value.
D. Print Count Value.
E. Print Scale Factors (Count & Rate) Values.
F. Print Presets 1 & 2 Values.
G. Print Counter Load Value.
H. Print Mnemonics for all Values.
A print out from a Legend unit with an address of 1 and all print options
selected is shown below:
1
RT
54
1
PEK
100
1
VAL
0
1
CNT
4000
1
SFC
1.0000
1
SFR
1.0000
1
P1
500
1
P2
1000
1
CLD
-100
When using this program, the Serial Transmit Delay should be set to 0.100
seconds.
SERIAL CONNECTIONS
When wiring, remove the 12-position terminal block, which is the top
board at the rear of the unit. Refer to the numbers listed on the top label with
the terminal description for installing each wire in its proper location.
The two data (transceiver) wires connect to the TX/RX (+) and TX/RX (-)
terminals. It is recommended that shielded (screened) cable be used for serial
communications. This unit meets the EMC specifications using Alpha #2404
cable or equivalent. There are higher grades of shielded cable, such as, four
conductor twisted pair, that offer an even higher degree of noise immunity.
In some applications a signal ground may be required to establish a ground
reference. The signal ground is required if the equipment does not have
internal bias resistors connected to the RS485 transceiver lines. The signal
ground is connected from only one legend to the RS485 equipment. If
necessary the shield can be used as the signal ground.
When all connections are made, replace the terminal block into its proper
location.
TERMINAL DESCRIPTIONS
COMM. -
Common required for some applications.
TX/RX (+) & TX/RX (-) -
The Legend transmits and receives on these two
terminals which are connected to the external device.
TX EN. -
Used primarily to connect Legends in a 20 mA communication loop
with other units.
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