Philips Fm2 Service Manual

							Mechanical Description
Chapter 1 - General Information
9
with the monitor, please see “Parallel I/O Communications Interface” on 
page 18. 
For further details of the pinouts and the cable specifications, see 
Chapter 2,“System Interfaces”.
Keypad and Navigation Wheel
There are seven front-panel switches, two LEDs, and one wheel push-button 
switch. All of these buttons go to the main-board except for the ON/OFF push 
button, which goes directly to the power supply. The software monitors these 
signals to determine which buttons were pushed. The two LEDs are located on 
the control panel and inform the user of mains or battery operation.
The wheel consists of a mechanical rotary encoder wheel with a momentary 
push button switch. As the knob is rotated, quadrature-coded outputs are 
generated. The phase relationship between the two signals, in quadrature, reflect 
the clockwise or counter clockwise rotation of the wheel. This relationship is 
translated to move the cursor on the LCD display forward or backward, 
depending on which way the wheel is rotated. 
Power Supplies
The unit is operated from a 6-volt 4 AH sealed lead acid battery. The power 
supply provides enough power to charge the battery even when the unit is 
operating.
The monitor power is controlled by alternate button closures of the front panel 
membrane switch. Unit operation starts only via a push of the front panel 
button, but operation will stop after a delay of a few seconds when pushing the 
front-panel membrane switch. This delay permits the main-board processor to 
shut down in an orderly fashion, after storing the parameters and data, if any. 
						

							Measurements Channels
10Chapter 1 - General Information
Measurements Channels
Ultrasound Channel
The monitor has two ultrasound sockets, US 1 and US 2, located on the side 
panel of the monitor. Either one or two M1356A ultrasound transducers can be 
connected. The latter case allows twins monitoring. (Refer to the 
Instructions for 
Use
 for transducer specifications). 
The transmitter pulsing the ultrasound transducer is gated by control circuitry, 
and return signals are processed in the CODEC circuitry on the main board. 
Toco Channel
The Toco circuit uses a Wheatstone bridge, with two strain gauge elements 
mounted on a load beam. The differential output voltage is proportional to the 
force applied to the load beam through the plunger. The Toco circuit is powered 
from a single regulated 5V-supply excitation.
The amplified and filtered TOCO signal is converted by a 12-bit analog to 
digital converter, providing an output scale of 2.56LSBs/gram.
Mountings
The monitor can be mounted in two ways using the following optional items:
GCX roll stand (M3909A)
GCX wall-mount (M3904A)
Refer to the fitting instructions that come with the relevant option. 
						

							Routine Maintenance and Cleaning
Chapter 1 - General Information
11
Routine Maintenance and Cleaning
For detailed instructions on how to clean the monitor and the monitoring 
accessories, see the 
Instructions for Use.
For instructions on cleaning the Recorder, refer to the 
Instructions for Use. 
						

							Routine Maintenance and Cleaning
12Chapter 1 - General Information 
						

							Chapter 2 - System Interfaces13
2
System Interfaces
Overview
The monitor has the following system interfaces:
Serial I/O interface 
Parallel I/O interface 
Note—The serial and parallel interfaces are not electrically isolated against 
each other.
Serial I/O Communications Interface
The RS-232 interface is totally isolated from the interface board through the use 
of high-speed optical isolators and isolated 5-volt power supply.
The RS-232 communications interface port is for communicating with:
a desktop modem (see “Supported Modems” on page 14)
a GSM cell phone modem (see “Supported Modems” on page 14)
a PC/AT computer
The RS-232 communications protocol supports connections to OB 
TraceVue. 
These connections are:
direct (cable) connection to the OB 
TraceVue system, to supply real-time 
patient data (System Online). 
via modem to supply complete patient records (System Batch).
It will also be used for software upgrades in the future. 
						

							Supported Modems
14Chapter 2 - System Interfaces
The pinouts for the DB9 connector are shown in the following table. 
The cable (M1380-61624) is a 3 meter long, fully wired RS-232 Null-modem 
cable supplied with the viewer software. It is also available as an OB 
TraceVue 
option.
Supported Modems 
Note—As modems are not designed to fulfil the electrical requirements of a 
medical device in terms of leakage current and isolation, a modem must be 
located outside of the patient vicinity.
The following modems are the only modems that are currently validated and 
supported: Table 1 Fully wired DB9 RS-232 Null-modem pinouts
PinConnects 
to pinSignalDetails
1 and 6 4 DTR Data Terminal Ready
2 3 TxD Transmit data to external devices
3 2 RxD Receive data to external devices
4 1 and 6 DCD, DSR Data Carrier Detect, Data Set 
Ready
5 5 Gnd RS-232 Ground
78 CTS Clear To Send
87 RTS Request To Send
9 9 - Ring indicator, not connected 
						

							Supported Modems
Chapter 2 - System Interfaces
15
a MultiTech Systems MT-5600ZDX desktop modem 
a Nokia 6210GSM cellular phone modem (GSM type) 
MultiTech Systems MT-5600ZDX
Modem
Default
Initialization
StringThe monitor sends the following default modem initialization string:
‘ATE0X4&K0\r’
This is the first string sent by the monitor, and it is not customizable, nor is it 
obvious to the user.
The monitor expects to see an “OK” come back from the modem after the 
initialization string has been sent. 
If an “OK” is returned to the monitor (that is, confirmation that a modem is 
connected), the monitor then sends the user-customizable initialization string, 
preceded by “AT” and followed by ”
”.
The Attention characters, ‘AT’, at the beginning of the initialization string start 
the command mode. The ‘
’ at the end represents a Return, when the characters 
entered in the command line and stored in the modem’s command buffer are 
executed. The monitor always automatically enters the Attention (AT) and 
Return (
) characters.
Therefore, the user never needs to enter “AT” or “
”.
The dialing also works in the same manner. The user never needs to enter the 
return “
” after the phone number. First, the monitor sends “AT D”, then the 
user-entered phone number, then “
”. “AT D” is simply the command to dial 
with whichever dialing method is set as the default. (The default setting as 
shipped is Tone dialing.)
If it is necessary to change the dialing method from Tone to Pulse, or vice versa, 
then this is specified in the user-entered initialization string.
For example, to change to the Pulse dialing method, simply enter a P in the 
modem initialization string.  
						

							Supported Modems
16Chapter 2 - System Interfaces
The components of the default initialization string are explained in the 
following table.
For detailed information about the MultiTech Systems MT-5600ZDX and how 
to set it, please refer to the modem’s Owner’s Manual. Table 2 MultiTech MT-5600ZDX initialization string 
commands
CommandExplanation
E0 Switches to verbose mode. To establish whether a modem 
connection is effective, the modem replies to the signal sent 
by the monitor with an ‘OK’ signal, or an error signal, rather 
than just a result code (e.g. 0, 1, etc.). If an ‘OK’ is received, 
then it is positive confirmation that the modem is connected 
and functional.
X4 Switches to extended result codes, along with smart dialling.
The modem checks for a dial tone, dials, then checks for a 
ring back or a busy signal after dialling.
This is not appropriate in local exchange branches.
X0 Selects basic result codes and blind dialling (dials even if there 
is no line), as an alternative to use in local exchange branches.
&K0 No modem initiated flow control (disables the flow control).
150
US
20
TOCO
(5)
JANE DOE 194848
16:34:12   2/14/2001
cm
 min.3
Communications Menu
Paper OutputCurrent RecordPaper Speed(3 cm/min)Paper Style
Number to Dial
Return
Data TransferStopped
DestinationPrinter/Recorder
Modem Initialization     OK                  Cancel            Clear
Set Modem Init String
0TX  
						

							Supported Modems
Chapter 2 - System Interfaces
17
The commands above are only applicable to Rockwell/Conexant-based 
MultiTech Systems modems. At the time of printing, the MultiTech MT-
5600ZDX is the only desktop modem that has been validated for use with the 
monitor.
The monitor may also work with other modems, but this has not been tested, 
and consequently no other modems are officially supported.
Customers may use any other modem after successful verification of several trace 
transmissions.
Nokia 6210GSM
Instead of a conventional wired phone connection using a desktop modem, a 
cellular phone can be used to transmit traces to the viewer or to OB 
TraceVue.
At the time of printing, the Nokia 6210GSM is the only cellular phone to date 
that has been validated for use with the monitor.
Customers may use any other modem after they have successfully verified several 
trace transmissions. 
						

							Parallel I/O Communications Interface
18Chapter 2 - System Interfaces
Parallel I/O Communications Interface
Caution
General-purpose personal computers and modems are not designed to 
meet the electrical safety requirements of medical devices. The RS-232 and 
parallel connectors on the monitor are electrically isolated to permit safe 
connections to non-medical devices, which should be connected with a 
cable of sufficient length to prevent the non-medical equipment from 
contacting the patient.
If a non-medical device is connected to the serial port, a recorder or 
printer connected at the same time to the parallel port should be located 
outside the patient vicinity, as the two interfaces are not isolated against 
eachother.
The parallel communications port is used to connect the FM-2 to the Recorder 
or to a standard PCL Level 3 printer. Supported printers that have been 
validated at the time of printing are:
HP Deskjet 640c
HP Deskjet 840c
HP Deskjet 990 CXi
HP Deskjet 980 CXi
HP Deskjet 960c
HP Deskjet 840c
HP Deskjet 640c
HP Deskjet 350
HP Photosmart 1215
A standard PC parallel printer cable is used (IEEE-1284 compliant). This is 
supplied with the recorder.
Although the same cable is used to connect the monitor to the Recorder or a 
PCL Level 3 printer, a different protocol is used for communicating between the 
monitor and the Recorder. This protocol does not conform to the IEEE 1284 
norm, and is actually a serial connection.