Hardware reference guide

Modbus Plus NOM
274
35013379 11/2011
Front Panel Switch
A three-position slide switch is located on the front of the unit. This switch is used to
select the comm parameter settings for the Modbus (RS-232) port. The three
options that are available, as shown in the figure below, include setting the slide
switch in the top position (ASCII), middle position (RTU), or bottom position (Valid
mem comm port parameters).
Optical Transmitter Specifications
Optical Power (Measured with 1 m
test fiber)
-12.8 ... -19.8 dBm average power in 50/125 micron
fiber cable
-9.0 ... -16 dBm average power in 62.5/125 micron fiber
cable
-3,5 ... -10.5 dBm average power in 100/140 micron
fiber cable
Rise/Fall Time 20 ns or better
Silence (OFF leakage) -43 dBm
Optical Receiver Specifications
Receiver Sensitivity -30 dBm average power
Dynamic Range -20 dB
Detected Silence -36 dBm
Miscellaneous Specifications
Diagnostics Power Up Runtime
RAM RAM
RAM Address RAM Address
Executive Checksum Executive Checksum
Processor
Power Dissipation 4 W
Bus Current Required 750 mA max
External Power Not required for this module
Specifications