Impulse 2807 - Manual (Page 9)

© Sealevel Systems, Inc. - 7 - SeaLINK+8.VC User Manual
Optional DC Power on Pin 5
The 2807 is USB bus powered, so no external power supply is required. For
conveniently powering serial peripherals, ordering options allow an external power
source up to be connected to a DC jack on the rear of the unit. The supplied power is
connected to pin 5 on each of the eight RJ45 connectors. Each serial port utilizes an
auto-resetting fuse rated at 500mA. Ordering options are shown below:
Item# 2807-DC05
Configured for 5VDC input power using a 2.1mm DC jack
Item# 2807-DC12
Configured for 12VDC input power using a 1.3mm DC jack
Item# 2807-DC24
Configured for 24VDC input power using a 1.3mm DC jack
Optional RJ45 to DB9 RS-232 Adapter
Preconfigured for use with Sealevel USB RJ45-enabled serial adapters, the RJ45 to
DB9 modular adapter (item# RJ9P-232) converts the RJ45 RS-232 pin out to a DB9
male RS-232 serial port. Standard CAT5 patch cables can be used to extend the
serial port up to 50 feet away from the RJ45 port. The pin out for the RJ9P-232 is
shown below.
RS-485 Biasing and Termination
120Ω termination resistor always present
between Data+ and Data-
510Ω Biasing pull-up resistors on Data+
510Ω Biasing pull-down resistors on Data-