Instruction manual

54 RFT9739 Field-Mount Transmitter Instruction Manual
Startup
continued
Communication
configuration mode
Switch 5 on the transmitter electronics module allows the user to select
the standard communication configuration or establish a user-defined
configuration. The communication configuration mode allows the user to
configure the transmitter's digital output using the display and the Scroll
and Reset knobs.
• If switch 5 is in the USER DEFINED position (see
Section 2.3
,
page 5), enter the communication configuration mode from any
process variable screen by rotating and holding the Scroll knob, then
rotating the Reset knob. In the communication configuration mode,
"M1", "M2", or "M3" appears in the upper left corner of the screen.
• For RFT9739 software versions 3.6 and later, if switch 5 is in the STD
COMM position, an error message will be displayed if an attempt is
made to change the communication configuration using the RFT9739
display controls.
• Hardware switches can also be used for configuring the transmitter's
digital communication output. For more information about using
hardware switches, see
Section 2.3
, page 5.
M1 — Baud rate
To set the baud rate:
1. Rotate and release the Scroll knob to view each baud rate option.
Choose from 1200, 2400, 4800, 9600, 19200, or 38400 baud.
2. Rotate and hold the Reset knob to select the displayed baud rate.
Release the Reset knob when the display stops flashing.
3. When the selected baud rate flashes again, rotate and release the
Reset knob to move to the M2 screen.
M2 — S=Stop bits, P=Parity
To set the stop bits and parity:
1. Rotate and release the Scroll knob to view each stop bit (S) option.
Choose 1 stop bit or 2 stop bits.
2. Rotate and hold the Reset knob to select the displayed stop bit.
Release the Reset knob when the display stops flashing.
3. When the selected stop bit flashes again, rotate and release the
Reset knob to move to the parity (P) options.
4. Rotate and release the Scroll knob to view each parity (P) option.
Choose from odd parity (O), even parity (E), or no parity (N). HART
protocol requires odd parity; Modbus protocol requires odd parity,
even parity, or no parity, depending on the host controller.
5. Rotate and hold the Reset knob to select the displayed parity.
Release the Reset knob when the display stops flashing.
6. When the selected parity flashes again, rotate the Reset knob to
move to the M3 screen.