RS485 APPLICATION:
Make sure RS485 Terminal Equipment (RS-485 to RS232 Converter) is con-
figured for bidirectional Multi drops Two-Wire Half-Duplex operation (TX+ is
connected to RX+ and TX- is connected to RX-). Connect the unit TX(-) line
(pin 5) to the terminal TX- line, connect the unit RX+ line (pin 6) to the termi-
nal TX+ line. Connect the
I/O
GND (pin 8) to terminal GND (if applicable).
To program the module remove power from the unit and install the short-
ing plug on jumper JP1 between pins 2 and 3.
Apply power to the unit and follow the on screen instructions. When pro-
gramming is completed turn the unit off, place the shorting plug on jumper
JP1 on pins 1 and 2 to return the module to run mode, the new settings will
take affect when the unit is powered on. The initial power on defaults are
9600 baud, 8 data bits, 1 stop bit, no parity, error checking off, address 0.
(g)
CALIBRATION PROCEDURE
g.1
Equipment Required for Calibration
You will need a 3-1/2 digit DMM set to the selected analog output range
(see Selecting Operating Mode), a power supply and, a dumb terminal or
PC running a communications program, such as Procomm.
g.2 Calibration
Connect the dumb terminal or PC.
RS232 APPLICATION:
Connect the unit TX line to the terminal RX line,
connect the unit RX line to the terminal TX line. Connect the
I/O
GND (pin
8) to the SG line terminal.
RS485 APPLICATION:
Make sure RS485 Terminal Equipment (RS-485
to RS232 Converter) is configured for bidirectional Multi drops Two-Wire
Half-Duplex operation (TX+ is connected to RX+ and TX- is connected to
RX-). Connect the unit TX(-) line (pin 5) to the terminal TX- line, connect
the unit RX+ line (pin 6) to the terminal TX+ line. Connect the
I/O
GND
(pin 8) to terminal GND (if applicable).
Apply power to the
I/O
, issue the calibrate command and follow the on
screen instructions. See Host C command for format.
5
Note:
All
I/O
conditioners are calibrated on the factory for
0 - 5V mode. Usually it is not necessary to calibrate unit,
unless 4 to 20 mA mode is required.
