Introduction; Mechanical Specifications; Manual Control - JFW 50MS-192 Operating Manual

The JFW model 50MS-192 is a 24 Input x 3 Output non-blocking matrix switch with programmable
step attenuators on each of the three outputs. The matrix covers the band of 800-2400MHz and is
controlled remotely via Ethernet or RS-232. The unit is manually controlled on the front panel
using the keypad and LCD display. During startup, the 50MS-192 detects the position of the slide
switch on the back panel and boots up with the selected control type (RS-232 or Ethernet). If the
user decides to change control types, the unit must be powered down, the switch changed and then
powered back up. The unit will then default back to the factory default startup settings. These
settings are that all three attenuators are set to their maximum attenuation level (63dB) and the
inputs are all set to OFF.
In addition to this manual a CD is also provided. The CD contains the following:
1) 50MS-192 Manual.PDF
2) 50MS-192 Specification Sheet.PDF
3) 50MS-192 Outline Drawing.PDF
4) JFW test program (50MS-192.EXE)
5) Sample Ethernet Configuration Session.PDF
The 50MS-192 is designed in a standard 19" rack enclosure assembly to remain compatible
with most laboratory test racks. The outline drawing details all necessary package dimensions and
connector layouts. The unit is AC powered via a 3-prong receptacle on the rear panel. A standard
power cord is supplied with the unit. The power supply itself is a universal AC power supply that
can handle input AC voltages 100-240 VAC (47-63 Hz).
The 50MS-192 is also AC current protected by use of a 2 Amp "Slo-Blo" AC fuse. The fuse is field
replaceable in the event of any failure to the fuse. The fuse itself is a 5x20 mm "Slo-Blo" type fuse
and can be ordered through JFW or directly from Littelfuse. The Littelfuse part number is #215-
002. The JFW part number is #025-021.
The manual control is achieved with the keypad and LCD on the front panel of the unit. To change
from remote mode to manual mode, press the <1> button on the keypad. In manual mode you have
five basic options: press <1> to go back into remote mode, press <2> to set an attenuator to a new
value, or press <3> to read the attenuation setting of an attenuator <4> to route an input to a
specified output and <5> to read the state of a specified input.
If the unit is connected remotely to a user in either RS-232 or Ethernet mode and you switch to
manual mode, the unit will close that Ethernet connection or COM connection before starting
manual mode. While in manual mode, no remote connections are allowed.

1 - Introduction

2 - Mechanical Specifications

3 - Manual Control

Rev 0, 7-27-06
Page - 3