Edwards Signaling Adaptatone 5530M-485 Series User manual

Installation Instructions for Catalog Series 5530M-485
Adaptatone® Millennium Signal
Description and OperationDescription and Operation
Description and OperationDescription and Operation
Description and Operation
EdwardsAdaptatoneisaheavy-duty,tone-selectable,stand
alone, indoor/outdoor audible signaling device intended
forindustrial applicationswhere highaudible outputand
microcomputer reliability are required. The Adaptatone
Millenniumseries are ULand cUL Listedas Audible Signal
Appliances for use in the following hazardous locations.
Catalog Current (A)
Number Voltage Standby Tone On
Standard Volume
5530M-485Y6 125V DC 0.10 0.21
250V DC 0.02 0.10
120V AC 50/60 Hz 0.10 0.32
240V AC 50/60 Hz 0.10 0.20
5530MHV-485Y6 125V DC 0.10 0.39
250V DC 0.02 0.19
120V AC 50/60 Hz 0.10 0.56
240V AC 50/60 Hz 0.10 0.34
5530MV-485Y6 125V DC 0.10 0.20
250V DC 0.02 0.10
120V AC 50/60 Hz 0.10 0.31
240V AC 50/60 Hz 0.10 0.20
Figure 1. Dimensions
P/N 3100345 ISSUE 2 © 2002
Catalog Hazardous Temp.
Number Locations Code
5530M-485Y6 Class I, Div. 2, Groups A, B, C, D T4 (135C)
5530MHV-485Y6 Class II, Div. 2, Groups F, G T5 (100C)
5530MV-485Y6 Class III, Div. 1 and 2
TheAdaptatone operates fromlocal power andsounds a
high decibel signal determined by the setting of minia-
ture programming switches inside the unit. The
Adaptatone may be programmed for any of the 27 tones
listed in Figure 7.
Speaker direction and the output level are easily adjust-
able.
Mechanical SpecificationsMechanical Specifications
Mechanical SpecificationsMechanical Specifications
Mechanical Specifications
Weight ...................................................9Pounds (4.1 kg)
Hazardous Locations, UL Standard UL1604
Ambient Temp. ................... +41F to +104F (+5C to +40C)
Non-Hazardous Locations
Variable Ambient Temp. .....-40F to +151F (-40C to +66C)
1. Mount Adaptatone as shown in Figure 2.
a. Flat Surface Mounting. Secure unit to
mountingsurface usingthe (4) mountingholes in
the mounting plate on the rear of the box. Use
the#10x3"(76mm)woodscrews(furnishedloose)
or other hardware (not supplied) suitable for the
mountingsurface.
b. Rigid Pipe Mounting. Loosenthe(4)coverscrews
from the signal box and lift off signal box cover.
CAUTIONCAUTION
CAUTIONCAUTION
CAUTION
During installation, care must be taken so that components
on the printed circuit board are not damaged.
Electrical SpecificationsElectrical Specifications
Electrical SpecificationsElectrical Specifications
Electrical Specifications
InstallationInstallation
InstallationInstallation
Installation
The Adaptatone may be mounted to any flat surface or
may be used as a freestanding unit mounted to a rigid
pipe. The Adaptatone must be installed in accordance
with the latest edition of the National Electrical Code or
other regulations applicable to the country and locality
of installation and by a trained and qualified electrician.
Dimensions
5530M 5530MHV
A 8 7/8" 11 1/2"
(225 mm) (292 mm)
B 8 1/4" 9 3/4"
(210 mm) (248 mm)
C 13" 14 1/4"
(330 mm) (362 mm)

P/N 3100345 ISSUE 2 PAGE 2
e. Optional. Connect external 24V DC battery (not
supplied) in series with separate diode assembly
part 2600010 (supplied) to TB1 terminals 3 and 4
on the main board as shown in Figures 3 and 4
and marked on the diode assembly.
NOTE: Terminal Block TB1 can be unplugged from the
main board to complete wiring as shown in
Figure 3.
NOTE: Cover screws are captive. Do not remove from
cover.
Removethe center knockoutin lower wallof box
and mount box to a 1/2" (12.7 mm) conduit pipe
using suitable connector.
2. Install wires through a knockout hole in the bottom
ofthe boxfrom araceway thatis, withitsconnections
tothe1/2"(12.7mm)conduitknockouthole,approved
forthe samedegree of protectionand enclosuretype
needed by the application. Use the provided plastic
tie-wrap,on thebarrier tothe electronics,to separate
incomingpower leads fromsignal andtone initiating
leads, per NEC (Figure 5).
Figure 2. Adaptatone Mounting
WARNINGWARNING
WARNINGWARNING
WARNING
To prevent fire and shock, wire the Adaptatone only as
describedinthisinstallation instruction.
WARNINGSWARNINGS
WARNINGSWARNINGS
WARNINGS
HIGH VOLTAGE is present when product is energized. High
volume may cause harm to personnel in close proximity.
5. Adjust volume level, if desired, by turning
potentiometerlocated onthe mainboard (Figure11).
3. Wire as follows referring to Figures 5 and 6.
a. Connect green and yellow-striped earth-ground
wiresto earth-ground.
b. Connect theRS485 wires toterminals +TX/RXand
-TX/RX on the RS485 COMM board (Figure 6).
c. If using the optional MR201/C relay, connect the
relay to +RELAY and -RELAY on the RS485 COMM
board(Figure 6).
d. Connect incoming power to wire leads using a
butt splice or other method listed, certified, or
otherwise approved by local authorities. Leads
are black and white.
WARNINGWARNING
WARNINGWARNING
WARNING
To ensure integrity of the enclosure: Ensure the cover
gasket, part number P-007549-0069, is adhered into
groove at cover perimeter before replacing the signal box
cover.
Ensure that the (4) collar gaskets, part number P-041930-
0362, are in place on each cover screw before securing the
signalbox cover.
When securing cover, start screws by hand, making sure
they are threaded into tapped holes in housing bosses
before securing with a screwdriver. Torque signal box cover
screws to a minimum of 20 in-lbs. This ensures the
required tight fit.
6. Tightly secure the signal box cover using (4) retained
cover screws.
7. Torque signal box cover screws to a minimum of 20
in-lbs.
WARNINGWARNING
WARNINGWARNING
WARNING
To ensure integrity of the Adaptatone assembly when
adjusting the speaker direction, make sure threads in the
enclosure remain fully engaged and do not turn speaker
more than 360 degrees from the original factory installed
position.
WARNINGWARNING
WARNINGWARNING
WARNING
To ensure integrity of the Adaptatone assembly, prior to
completion of installation, make sure threads in the
enclosure are fully engaged and ensure that the star nut is
wrenchtight.
9. Regardless of speaker direction adjustment, it is
importantthat thestarnut betightened wrenchtight
toensure thespeaker position ismaintained securely.
10. Verify operability.
11. For tone selection and operation, refer to Figure 7
and the "Protocol" section of these installation
instructions.
8. To adjust speaker direction, loosen large star nut
(Figure2)andturnspeakerto theapproximatedesired
position.
Speaker
Large star nut to
adjust speaker
direction
Signal Box
(4) Cover
screws
(4) Collar
gaskets
Raceway and connections
(not supplied) to
1/2" (12.7 mm) knockout
hole
(4) #10 x 3" (76 mm)
screws or other hardware
suitable for the mounting surface

P/N 3100345 ISSUE 2
PAGE 3
CAUTIONCAUTION
CAUTIONCAUTION
CAUTION
Ensure that power is disconnected before cleaning inside of
unit.
Maintenance andMaintenance and
Maintenance andMaintenance and
Maintenance and TT
TT
Testest
estest
est
Examine the unit semi-annually for accumulation of dirt.
Clean if necessary.
ProtocolProtocol
ProtocolProtocol
Protocol
1.0 Setting Unit Address and Network Baud Rate
1.1 Locate the 8-position dip switch, S1, on the top edge of the RS485 COMM board (Figure 6).
1.2 Unit address range is 00-1F hex. (00-31 decimal). Refer to Table 2.2 for unit address configuration. Set S1
positions 1-5 for the desired unit address configuration.
Table 2.2 Unit Address Switch Configuration
Unit Address S1-1 S1-2 S1-3 S1-4 S1-5
Hex Decimal
00 00 OPEN OPEN OPEN OPEN OPEN
01 01 CLOSED OPEN OPEN OPEN OPEN
02 02 OPEN CLOSED OPEN OPEN OPEN
03 03 CLOSED CLOSED OPEN OPEN OPEN
04 04 OPEN OPEN CLOSED OPEN OPEN
05 05 CLOSED OPEN CLOSED OPEN OPEN
06 06 OPEN CLOSED CLOSED OPEN OPEN
07 07 CLOSED CLOSED CLOSED OPEN OPEN
08 08 OPEN OPEN OPEN CLOSED OPEN
09 09 CLOSED OPEN OPEN CLOSED OPEN
0A 10 OPEN CLOSED OPEN CLOSED OPEN
0B 11 CLOSED CLOSED OPEN CLOSED OPEN
0C 12 OPEN OPEN CLOSED CLOSED OPEN
0D 13 CLOSED OPEN CLOSED CLOSED OPEN
0E 14 OPEN CLOSED CLOSED CLOSED OPEN
0F 15 CLOSED CLOSED CLOSED CLOSED OPEN
10 16 OPEN OPEN OPEN OPEN CLOSED
11 17 CLOSED OPEN OPEN OPEN CLOSED
12 18 OPEN CLOSED OPEN OPEN CLOSED
13 19 CLOSED CLOSED OPEN OPEN CLOSED
14 20 OPEN OPEN CLOSED OPEN CLOSED
15 21 CLOSED OPEN CLOSED OPEN CLOSED
16 22 OPEN CLOSED CLOSED OPEN CLOSED
17 23 CLOSED CLOSED CLOSED OPEN CLOSED
18 24 OPEN OPEN OPEN CLOSED CLOSED
19 25 CLOSED OPEN OPEN CLOSED CLOSED
1A 26 OPEN CLOSED OPEN CLOSED CLOSED
1B 27 CLOSED CLOSED OPEN CLOSED CLOSED
1C 28 OPEN OPEN CLOSED CLOSED CLOSED
1D 29 CLOSED OPEN CLOSED CLOSED CLOSED
1E 30 OPEN CLOSED CLOSED CLOSED CLOSED
1F 31 CLOSED CLOSED CLOSED CLOSED CLOSED
TheAdaptatone should betested annually oras required
bythe authority having jurisdictionto ensure continuous
service.

P/N 3100345 ISSUE 2 PAGE 4
1.3 RS485COMM supports1200, 2400,9600 and19200 baudrate using8 databits andone stopbit. Parityis not
supported. Refer to Table 1.3 for Baud Rate switch configuration. Set S1 positions 6-7 for the desired Baud
Rateconfiguration.
Table1.3 Network BaudRate setting
Baud Rate S1-6 S1-7
1200 OPEN OPEN
2400 CLOSED OPEN
9600 OPEN CLOSED
19200 CLOSED CLOSED
1.4 Set 100-ohm termination resistor (if required). Network termination is required if the unit is located at the
beginning or end of the network bus. Termination reduces unwanted reflections caused by data signal
propagationdue tolong wireruns.Refer toTable 1.4for switchconfiguration. SetS1position8for network
termination if required.
Table1.4 Terminationsetting
Termination (100 ohms) S1-8
Enabled CLOSED
Disabled OPEN
2.0 Messaging Format
2.1 The RS485 COMM utilizes the Edwards SigNet ASCII protocol for data messaging. Each unit is capable of
consuming and/or producing messages from the master controller. SigNet message format is illustrated
below.
<STX><UA> <DDDD><ZONE> <ETX> <CHKSUM>
<STX> The <STX> character has a value of 2 hexadecimal and is required at the start of
every message (1 byte).
<UA> Two byte ASCII representation of the hex Unit. Example - If unit address 0A is
chosen, the two byte <UA> data field would contain ASCII ‘0’ and ‘A’ written in
ASCII format as 0A. Valid data range is ASCII 00 - 1F.
<DDDD> ASCII data field. (4 bytes total). These bytes contain commands, tone/message
andtimed sequence data.
<ZONE> Programmable unit Zone issued by the master or controlling computer
RangeASCII A-D(1 byte).Note –Zone valueis notretainedafter powerloss unless
battery backup is installed. Value defaults to Zone A on power up.
<ETX> The <ETX> character has a value of 3 hexadecimal and is required at the end of
everymessage (1 byte)
<CHKSUM> Optional two byte Message Block checksum (2 bytes). Refer to Section 4.0 for
Blockchecksum calculation and verification.If checksum isnotdesired, must pad
these two bytes with two ASCII zeros 00.
3.0 Message Command Set
3.1 Tone/Message Command -00-1F
SendFormat: <STX><UA><TONE> <TIME> <ZONE><ETX> <CHKSUM>
<UA> Unit address characters (2 bytes). See Section 2.0, Messaging Format
<TONE> Tone/Message to be played by the unit. Example - If tone 06 is chosen, the two
byte<TONE> data fieldshould contain ASCII‘0’ and ‘6’written in ASCIIformat as
06. Range ASCII 00-1F(2 bytes). See Tone Chart for a list of available tones or
messages.
<TIME> Timesequence forTone/Message tobe played (00-99seconds). Forcontinous play
of Tone/Message, use ‘00’ in this data field. Range ASCII 00-99 (2 bytes)
<ZONE> Units matching this zone field will play Tone/Message indicated in the <TONE>
datafield forspecifiedtime indicatedin <TIME>datafield. Allother zonesremain
in standby mode.

P/N 3100345 ISSUE 2
PAGE 5
<ETX> The <ETX> character has a value of 3 hexadecimal and is required at the end of
everymessage (1 byte)
<CHKSUM> Optional two byte Message Block checksum (2 bytes). Refer to Section 4.0 for
Blockchecksum calculation and verification.If checksum isnotdesired, must pad
these two bytes with two ASCII zeros 00.
3.2 BROADCASTCOMMAND -41
Send Format: <STX> 41 <TONE> <TIME> <ZONE> <ETX> <CHKSUM>
<41> In thiscommandtype, twobyteASCII ‘41’replaces<UA> characters.Thiscommand
is issued to all units containing the identical <ZONE> field.
<TONE> Tone/Messagetobe played bythe unit.See tonechart fora listof available tones/
messages. Range ASCII 00-1F (2 bytes).
<TIME> Time sequence for Tone/Message (00-99 seconds). For continous play of Tone/
Message, use ‘00’ in this data field. Range ASCII 00-99 (2 bytes)
<ZONE> Units matching this zone field will play Tone/Message indicated in the <TONE>
datafield forspecifiedtime indicatedin <TIME>datafield. Allother zonesremain
in standby mode.
<ETX> The <ETX> character has a value of 3 hexadecimal and is required at the end of
everymessage (1 byte)
<CHKSUM> Optional two byte Message Block checksum (2 bytes). Refer to Section 4.0 for
Blockchecksum calculation andverification. If checksumis not desired,must pad
these two bytes with two ASCII zeros 00.
Unit Response: None
Example: <STX>410530B<ETX>00
Unitsprogrammed withZone ‘B’only to playTone05for 30seconds thenshut off
automatically. Checksum characters not used in this example.
Note: do not use spaces between message characters in the above example.
3.3 POLL COMMANDand SET UNIT ZONE -43
Send Format: <STX><UA>43<00><ZONE><ETX><CHKSUM>
<UA> Unit address, ASCII Range 00-1F (two bytes)
<43> Two byte ASCIICommand denotingPOLL Commandor Zone Assignment(2 byte).
<00> Two byte ASCII ‘00’ used as protocol padding (two byes)
<ZONE> Programmable unit zone character. Range ASCII A-D. (1byte)
<ETX> The <ETX> character has a value of 3 hexadecimal and is required at the end of
everymessage (1 byte)
<CHKSUM> Optional two byte Message Block checksum (2 bytes). Refer to Section 4.0 for
Blockchecksum calculation andverification. If checksumis not desired,must pad
these two bytes with two ASCII zeros 00.
Unit Response: <STX><UA>43<STATUS><ZONE><ACK><ETX><CHKSUM>
<UA> Unit address, ASCII Range 00-1F (two bytes)
<43> Two byte ASCII Command echoed back from receiving unit (2 byte).
<STATUS> Unit’s current diagnostic state. Range ASCII A - D. (1byte)
A = Tone/Message is active and Local Power is absent
B = Tone/Message is active and Local Power is present
C = Tone/Message is not active and Local Power is absent
D = Tone/Message is not active and Local Power is present
<ZONE> Unit'sprogrammed zone character
<ACK> This <ACK> character has a value of 6 hexadecimal and represents
acknowledgement of the received command with valid checksum (1byte).

P/N 3100345 ISSUE 2 PAGE 6
Note: In the event that a bad checksum is calculated, by the receiving unit, it will reply with a <NAK>
character instead. The <NAK> character has a value of 15 hexadecimal.
<ETX> The <ETX> character has a value of 3 hexadecimal and is required at the end of
everymessage (1 byte)
<CHKSUM> Receiving unit calculates two-byte checksum and returns ASCII value. Refer to
Section 4.0 for Block checksum calculation and verification.
Example 1: <STX>014300A<ETX>00
Unit 01 is being polled and programmed to Zone A
Unit Response: <STX>0143DA<ACK><ETX>56
The unit returned a <STATUS> ‘D’ for its current diagnostic state and an <ACK>
character because both message and checksum are valid. The unit is not actively
playingTone/Message.The calculatedtwo-bytemessage checksum was‘56’.
Example2: <STX>014300A<ETX>00
Unit 01 is being polled and programmed to Zone A. Unit 01 is currently playing a
Tone/Message.
Unit Response: <STX>0143BA<ACK><ETX>54
The unit returned a <STATUS> ‘B’ for its current diagnostic state and an <ACK>
character. The unit is actively playing a Tone/Message at the time this command
was received. The calculated two-byte message checksum was ‘54’.
3.4 TIME SEQUENCE,TIME REMAININGCOMMAND - 44
Send Format: <STX><UA>4400 <ZONE><ETX> <CHKSUM>
<UA> Unit address characters (2 bytes). See Section 2.0, Messaging Format
<44> Two byte ASCII Command denoting a Time Sequence (2 bytes).
<00> Two byte ASCII ‘00’ used as protocol padding (two byes)
<ZONE> Programmable unit Zone issued by the master or controlling computer
Range ASCII A-D (1 byte).
<ETX> The <ETX> character has a value of 3 hexadecimal and is required at the end of
everymessage (1 byte)
<CHKSUM> Optional two byte Message Block checksum (2 bytes). Refer to Section 4.0 for
Blockchecksum calculation andverification. If checksumis not desired,must pad
these two bytes with two ASCII zeros 00.
Unit Response: <STX><UA> 44 <TIME LEFT><ACK><ETX> <CHKSUM>
<UA> Unit address characters (2 bytes). See Section 2.0, Messaging Format
<44> Two byte ASCII Command 43 echoed back from the receiving unit (2 bytes).
<TIMELEFT> Represents secondsleft, inhexadecimal format, untilthe unitstops playingactive
Tone/Message. Range 00-63 hex (2 bytes). The unit’s internal counter returns the
time remaining in seconds represented by a two byte hexadecimal value in the
above data field.
Note: For non-timed events, the unit returns two ASCII zeros ‘00’.
<ACK> Unit received a complete message and checksum characters are valid.
Note: In the event that a bad checksum is calculated, by the receiving unit, it will
reply with a <NAK> character instead. The <NAK> character has a value of 15
hexadecimal.
<ETX> The <ETX> character has a value of 3 hexadecimal and is required at the end of
everymessage (1 byte)
<CHKSUM> Receiving unit calculates two-byte checksum and returns ASCII value. Refer to
Section 4.0 for Block checksum calculation and verification.
Example 1: Priorto issuingCommand 44, themaster issuesa 99second timed sequenceevent
for Tone/Message 03 to play on unit address 1F.

P/N 3100345 ISSUE 2
PAGE 7
Command: <STX>1F0399A<ETX>00
9 seconds after issuing command from above, the master issues the “Time
Remaining”Command 44
Command:<STX>1F4400A<ETX>00andtheunitreplieswiththefollowingmessage.
Reply: <STX>1F445A<ACK><ETX>5E
Value 5A(90decimal) isthe hexadecimalrepresentationof secondsleft beforethe
timedsequence event completesand Tone/Message stops.
3.5 DEVICE TYPE COMMAND - 45
Send Format: <STX><UA>45<00><ZONE> <ETX><CHKSUM>
<UA> Unit address characters (2 bytes). See Section 2.0, Messaging Format
<45> Two byte ASCII Command 45 denoting receiving unit’s Device type (2 bytes).
<00> Two byte ASCII ‘00’ used as protocol padding (two byes)
<ZONE> Programmable unit Zone issued by the master or controlling computer
Range ASCII A-D (1 byte).
<ETX> The <ETX> character has a value of 3 hexadecimal and is required at the end of
everymessage (1 byte)
<CHKSUM> Optional two byte Message Block checksum (2 bytes). Refer to Section 4.0 for
Blockchecksum calculation andverification. If checksumis not desired,must pad
these two bytes with two ASCII zeros 00.
Unit Response: <STX> <UA> <DEVICE TYPE> <vXX> <ETX> <CHKSUM>
<UA> Unit address characters (2 bytes). See Section 2.0, Messaging Format
<45> Two byte ASCII Command 45 echoed back from the receiving unit (2 bytes).
<DEVICETYPE> Device type is an ASCII string transmitted by the receiving unit that defines the
unit family product code. For Millennium devices, the return ASCII string is “M-
485”. For Edward’s Visual devices, the return ASCII string is “S-485”.
<vXX> Receiving Unit’s Firmware version and revision level.
<ETX> The <ETX> character has a value of 3 hexadecimal and is required at the end of
every message (1 byte).
<CHKSUM> Receiving unit calculates two-byte checksum and returns ASCII value. Refer to
Section 4.0 for Block checksum calculation and verification.
Example: Command: <STX>014500A<ETX>00
Response: <STX>01M-485v1.0<ETX>84
Unit address 01 returns “M-485” string and is configured with version 1, rev.0
firmware. Calculated two-byte checksum is ‘84’.
3.6 RELAYENERGIZE COMMAND - 31
Send Format: <STX><UA>31<TIME><ZONE> <ETX><CHKSUM>
<UA> Unit address characters (2 bytes). See Section 2.0, Messaging Format
<31> ASCII Command 31 denoting Relay Energize (2 bytes).
<TIME> Time sequence for relay ‘ON’ duration (00-99 seconds). For Continuos ‘ON’, use
ASCII ‘00’ in this data field. Range ASCII 00-99 (2 bytes)
<ZONE> Programmable unit Zone issued by the master or controlling computer
Range ASCII A-D (1 byte).
<ETX> The <ETX> character has a value of 3 hexadecimal and is required at the end of
everymessage (1 byte)
<CHKSUM> Optional two byte Message Block checksum (2 bytes). Refer to Section 4.0 for
Blockchecksum calculation andverification. If checksumis not desired,must pad
these two bytes with two ASCII zeros 00.
Response: <STX><UA>31<TIME><ACK> <ETX><CHKSUM>

P/N 3100345 ISSUE 2 PAGE 8
Example: <STX>1F3105<ACK><ETX>00
Unitaddress1Fenergizes relayfor5seconds thenshutoffautomatically.Checksum
characters not used in this example.
<UA> Unitaddress
<31> Two byte ASCII Command 31 echoed back from receiving unit.
<TIME> Received two byte ASCII time value
<ACK> Unit received valid message and checksum
<ETX> The <ETX> character has a value of 3 hexadecimal and is required at the end of
every message (1 byte).
<CHKSUM> Receiving unit calculates two-byte checksum and returns ASCII value. Refer to
Section 5.0 for Block checksum calculation and verification.
Note: Relay output commands are only valid when there is no tone/voice message
actively playing. Any tone/voice messages automatically overrides any relay output
commands sent to the unit.
3.7 RELAY DE-ENERGIZE COMMAND - 30
SendFormat: <STX><UA>30<00> <ZONE> <ETX><CHKSUM>
<UA> Unit address characters (2 bytes). See Section 2.0, Messaging Format
<30> ASCII Command 30 denoting Relay De-Energize (2 bytes).
<00> Two byte ASCII ‘00’ used as protocol padding (two byes)
<ZONE> Assigned unit Zone. Range ASCII A-D (1 byte)
<ETX> The <ETX> character has a value of 3 hexadecimal and is required at the end of
every message (1 byte).
<CHKSUM> Receiving unit calculates two-byte checksum and returns ASCII value. Refer to
Section 4.0 for Block checksum calculation and verification.
Response: <STX><UA>3000<ACK> <ETX><CHKSUM>
Example: <STX>1F3000<ACK><ETX>43
Unitaddress 1F de-energizesrelay output
<UA> Unitaddress
<30> Two byte ASCII Command 30 echoed back from receiving unit.
<00> Two byte ASCII ‘00’ used as protocol padding (two byes)
<ACK> Unit received valid message and checksum
<ETX> The <ETX> character has a value of 3 hexadecimal and is required at the end of
every message (1 byte).
<CHKSUM> Receiving unit calculates two-byte checksum and returns ASCII value. Refer to
Section 4.0 for Block checksum calculation and verification.
4.0 Verify and Calculate Message Block Checksum
4.1 MessageBlockchecksum canbeverified byaddingup allthehexadecimal charactersinthe receivedmessage
string, excluding the first character <STX> and the very last two checksum characters.
4.2 Thesum ofthese characters willproduce athree-byte hexadecimal value.The higherorder byte isnot used
andshould be dropped.The lowertwobytes areused for comparisonto the receivedchecksum characters.
See example Message String received below:
MessageString Received:
<STX> 0 1 4 3 D A <ACK> <ETX> 5 6
Not included in calculation
Messagecharacters
included Two byte ASCII checksum data field
not included in calculation, but used
for comparison to calculated results

P/N 3100345 ISSUE 2
PAGE 9
4.3 Calculating the checksum is done by first converting each ASCII character, found in the message string, to
the hexadecimal equivalent and then summing these characters. See below.
ASCII HEXADECIMAL
0 0x30
1 0x31
4 0x34
3 0x33
D 0x44
A 0x41
✓(ACK) 0x06
(ETX) 0x03
0x156 hexadecimal total
4.4 Dropping the upper hexadecimal byte from the above total yields a final result of 56 hexadecimal. The
calculated hexadecimal checksum value should match the ASCII value received in the message string. If it
does not match, a possible error occurred during transmission and the message is considered unreliable.
The master or controlling computer should try to resend the message again.
Example of a POLL Command 43 issued to unit 05, Zone B
<STX>054300B<ETX>
ASCII HEXADECIMAL
0 0x30
5 0x35
4 0x34
3 0x33
0 0x30
0 0x30
B 0x42
(ETX) 0x03
0x171 hexadecimal total
The calculated Message Block checksum are appended to the message string. Two bytes, ASCII 7 and
ASCII 1, consume these two checksum data fields. See below.
Send format: <STX>054300A<ETX>71
5.0 Wiring applications
RS-232 to RS-485 Multi or Single drop
RS-232 Port
DB9 F/M
(MCN485CB2323A9)
RS232/485 Converter
(MCN485CB2EOLT)
RS-485 cable
(up to 4000 ft)
Adaptatone
55XX-485Y6
Adaptatone
55XX-485Y6
Up to 32 units
(maximum)
IBM PC or Terminal

P/N 3100345 ISSUE 2 PAGE 10
PLC to RS-485 Multi or Single drop
RS-485 Multi or Point to Point
9 RI
8 CTS
7 RTS
6 DSR
5 COM
4 DTR
3 TXD
2 RXD
1 DCD
9 RI NOT USED
IBM PC or PLC
RS-232/485 Converter
(MCN485CB2EOLT
8 CTS
7 RTS
6 DSR
5 COM
4 DTR
3 TXD
2 RXD
1 DCD
RS-232 Port
DB9 F/M
(MCN485CB2323A9)
RS232/485 Converter
(MCN485CB2EOLT)
RS-485 cable
(up to 4000 ft)
Adaptatone
55XX-485Y6
Adaptatone
55XX-485Y6
Up to 32 units
(maximum)
PLC Controller
RS-485 Port
RS-485 cable
(up to 4000 ft)
Adaptatone
55XX-485Y6
Adaptatone
55XX-485Y6
Up to 32 units
(maximum)
PLC Controller
or
IBM PC with
RS485 Serial Port