Toa VS-900 Manual

VS-900
Security Intercom Systems
Remote Control and Monitoring
Programmer’s Guide
TOA Electronics, Inc.
601 Gateway Blvd., Ste. 300
So. San Francisco, CA 94080
1-650-588-2538 / 1-800-733-4750
V1, AllRightsReserved, 2002

TOA VS-900 Programmer’s Guide
2
Table of Contents
OVERVIEW ...................................................................................................................................................3
VS-900 DOCUMENTATION .........................................................................................................................3
USEFUL SOFTWARE TOOLS .....................................................................................................................3
CONNECTING TO THE VS-900MF MAINFRAME.......................................................................................4
DIRECT CONNECTION ...................................................................................................................................4
CONNECTION VIA MODEM.............................................................................................................................4
MESSAGE PACKAGING..............................................................................................................................5
REMOTE DIAL COMMAND..........................................................................................................................6
EXAMPLES...................................................................................................................................................8
1. REMOTE DIALING .....................................................................................................................................8
2. REMOTE DIALING – ALL CALL PAGING.......................................................................................................9
3. LOG DATA REQUEST ..............................................................................................................................10
4. LOG DATA FORMAT ................................................................................................................................10
Call From Normal Sub-station..............................................................................................................10
Station Call Reception..........................................................................................................................11
Call Operation Completion ...................................................................................................................11
Start of Normal Conversation...............................................................................................................12
Normal Call Termination.......................................................................................................................12
APPENDIX A - LOG STATUS MESSAGES...............................................................................................14
APPENDIX B - ASCII CHARACTER CODES............................................................................................16

TOA VS-900 Programmer’s Guide
3
Overview
Security system installations often require integration of the VS-900 Security Intercom systems with
touch-screen control systems, graphic annunciator panels, and camera controllers. TOA offers two
options for meeting this requirement:
1. The VS-900DI and VS-910DI interface products offer a hardware solution—they provide the call LED
outputs and select switch inputs required for graphic annunciator panels. They also provide relay outputs
for camera switcher integration. Using this off-the-shelf method requires no knowledge of computer
programming or serial communication.
2. The VS-900MF Mainframe has two integral serial ports for integration with a microprocessor-based
product (usually a PC or PLC) for remote control and monitoring of VS-900 activity. Serial communication
with the VS-900MF eliminates the need for installing VS-900DI and VS-910DI cards and elevates the
programmer's level of control.
This document targets programmers who need an understanding of how they can remote control and
monitor the VS-900 by communicating through its RS-232 ports.
Note: Descriptions of the protocol and all examples are written in hexadecimal (H). Appendix B includes a
chart for hex to decimal and ASCII conversion.
VS-900 Documentation
Please refer to the following VS-900 documents, shipped with the VS-900MF or available by request.
•VS-900 Installation Manual
•VS-900 Operating Instructions
•VS-900 Software Manual
Useful Software Tools
•MS Windows Calculator, usually located under Program Files\Accessories
•HyperTerminal Private Edition, available for download from http://www.hilgraeve.com
•ComLite32 Serial Com Port Monitor software available for download from http://www.rtcomm.com

TOA VS-900 Programmer’s Guide
4
Connecting to the VS-900MF Mainframe
The VS-900MF Mainframe includes two RS-232 serial communication connectors for operation,
monitoring, and programming of the system. Connect to either communication ports with the settings
described on page 5. You can control multiple exchanges from a single serial connection.
Direct Connection
Connection Via Modem

TOA VS-900 Programmer’s Guide
5
Communication Specifications
Transmission System: Half-duplex
Baud Rate: 19,200 Bps
Transmission Format: <1 Start Bit> <8 Data bits> <1 Even Parity Bit> <1 Stop Bit>
Message Packaging
Field Name Value Description Direction
DLE 10H Delimiter
ENQ 05H Enquiry
VS-900 to PC or
PC to VS-900
DLE 10H Delimiter
ACK 06H Acknowledge
VS-900 to PC or
PC to VS-900
DLE 10H Delimiter
STX 02H Start of Text
Message* Varies Remote Dial, Data Log
Request or Data Log
DLE 10H Delimiter
ETX 03H End of Text
BCC** Varies Block Check Character
VS-900 to PC or
PC to VS-900
DLE 10H Delimiter
ACK 06H Acknowledge
VS-900 to PC or
PC to VS-900
DLE 10H Delimiter
EOT 04H End of Transmission
VS-900 to PC or
PC to VS-900
*See the Remote Dial, Log Data Request or Log Data sections for more information.
** To calculate BCC, take the XOR of the combined Message, DLE, and ETX. (Refer to the shaded area
below). MS Windows Calculator (Scientific mode) is a useful tool for this function.
DLE STX MESSAGE DLE ETX BCC

TOA VS-900 Programmer’s Guide
6
Remote Dial Command
With the protocol below, you can remote dial and perform functions of individual Master Stations in
specific exchanges. To terminate any current functions, precede remote dialing content with “CC” (Clear
function x2).
Field Name Length
(Bytes)
Value Description Direction
DLE 110H Delimiter
ENQ 105H Enquiry PC to VS-900MF
DLE 110H Delimiter
ACK 106H Acknowledgement VS-900MF to PC
DLE 110H Delimiter
STX 102H Start Of Text
Command
"Remote Dial"
14EH Remote Dialing Command
Exchange # 2xxH, xxH Add 30H to each digit of the exchange
number.
Example: Exchange #01 = (30H, 31H)
Master Station # 1xxH Master Station #2 = (32H)
Dialing Contents* 32 Bytes
Total
MS-900 Master Station Dialing
Functions:
30H 0
31H 1
32H 2
33H 3
34H 4
35H 5
36H 6
37H 7
38H 8
39H 9
2AH *
23H #
43H C (Clear)
57H Off-hook
51H On-hook
45H PTT On
52H PTT Off
54H Register Switch On
59H Register Switch Off
58H Transfer
2DH 3 Second dial pause (For C/O lines)
4FH Disable Master Station
50H Enable Master Station
Note: Add "20H" after the designated
dialing contents until the total is 32 bytes
DLE 110H Delimiter
ETX 103H End Of Text
BCC 1xxH Block Check Character
PC to VS-900MF
DLE 110H Delimiter
ACK 106H Acknowledge VS-900MF to PC
DLE 110H Delimiter
EOT 104H End of Transmission PC to VS-900MF

TOA VS-900 Programmer’s Guide
7
Log Data Output Request
The VS-900 Log Data Output allows you to monitor most station and system activity. Send the string
below to initiate Log Data flow from individual or multiple exchanges simultaneously. Once the data
stream has been initiated, the VS-900MF will continue to send the log data without re-sending the
request.
Field Name Length
(Bytes)
Value Description Direction
DLE 110H Delimiter
ENQ 105H Enquiry PC to VS-900MF
DLE 110H Delimiter
ACK 106H Acknowledgement VS-900MF to PC
DLE 110H Delimiter
STX 102H Start Of Text
Log Data
Request
14FH Log Data Output Request command
Exchanges 230H 30H
ON/OFF Status
Exchange #01 –
16
16 30H or 31H OFF = 30H ON = 31H
DLE 110H Delimiter
ETX 103H End Of Text
BCC 1xxH Block Check Character
PC to VS-900MF
DLE 110H Delimiter
ACK 106H Acknowledge VS-900MF to PC
DLE 110H Delimiter
EOT 104H End of Transmission
After the initial Log Data Request, the VS-900MF will send an enquiry (DLE & ENQ, 10H & 05H) to the
PC when log data is available in the queue. The PC should then respond with an acknowledgement (DLE
& ACK, 10H & 06H) so the log data will be sent from the VS-900MF. This process will repeat until there is
no information left in log data queue.
Field Name Length
(Bytes)
Value Description Direction
DLE 110H Delimiter
ENQ 105H Enquiry VS-900MF to PC
DLE 110H Delimiter
ACK 106H Acknowledge PC to VS-900MF
DLE 110H Delimiter
STX 102H Start Of Text
Log Data Sent 16F Log data
Exchange # 2xxH xxH Exchange #01 – 16
Time (HH:MM:SS) 6Hours, Minutes, and Seconds
Line #1 6Varies, Refer to Appendix A
Line #2 6Varies, Refer to Appendix A
Line #3 6Varies, Refer to Appendix A
Line #4 6Varies, Refer to Appendix A
*Status # 2xxH xxH Varies, Refer to Appendix A
DLE 110H Delimiter
ETX 103H End Of Text
BCC 1xxH Block Check Character
VS-90MF to PC
DLE 110H Delimiter
ACK 106H Acknowledge PC to VS-900MF
DLE 110H Delimiter
EOT 104H End of Transmission VS-900MF to PC

TOA VS-900 Programmer’s Guide
8
Examples
1. Remote Dialing
The data sequence below will remote dial Master Station #1 in Exchange #1 to dial Sub-Station #105 and
initiate communication. The “CC” (Clear) is included to terminate any current Master Station functions.
Note: The total Dialing Contents must be 32 bytes.
Field Name Length
(Bytes)
Value Description Direction
DLE 110H Delimiter
ENQ 105H Enquiry PC to VS-900MF
DLE 110H Delimiter
ACK 106H Acknowledge VS-900MF to PC
DLE 110H Delimiter
STX 102H Start Of Text
Remote Dial 14EH Remote Dialing
Command
Exchange # 230H 31H EXCHANGE # "01"
Master Station # 131H MASTER # "1"
Dialing Contents 32 Bytes 43H 43H 31H 30H 35H
20H 20H 20H 20H 20H 20H
20H 20H 20H 20H 20H 20H
20H 20H 20H 20H 20H 20H
20H 20H 20H 20H 20H 20H
20H 20H 20H
"CC105"
DLE 110H Delimiter
ETX 103H End Of Text
BCC 179H Block Check Character
PC to VS-900MF
DLE 110H Delimiter
ACK 106H Acknowledge VS-900MF to PC
DLE 110H Delimiter
EOT 104H End of Transmission PC to VS-900MF

TOA VS-900 Programmer’s Guide
9
2. Remote Dialing – All Call Paging
The data sequence below will remote dial Master Station #2 in Exchange #3 to initiate All-Call Paging by
dialing *800#. Again, the “CC” (Clear) is included to terminate any current Master Station functions.
Note: The total Dialing Contents must be 32 bytes.
Field Name Length
(Bytes)
Value Description Direction
DLE 110H Delimiter
ENQ 105H Enquiry PC to VS-900MF
DLE 110H Delimiter
ACK 106H Acknowledge VS-900MF to PC
DLE 110H Delimiter
STX 102H Start Of Text
Remote Dial 14EH Remote Dialing Request
Exchange # 230H 33H EXCHANGE # "03"
Master Station # 132H MASTER # "2"
Dialing Contents 32 Bytes 43H 43H 2AH 38H 30H 30H
23H 20H 20H 20H 20H 20H
20H 20H 20H 20H 20H 20H
20H 20H 20H 20H 20H 20H
20H 20H 20H 20H 20H 20H
20H 20H
"CC*800#"
DLE 110H Delimiter
ETX 103H End Of Text
BCC 17DH Block Check Character*
PC to VS-900MF
DLE 110H Delimiter
ACK 106H Acknowledge VS-900MF to PC
DLE 110H Delimiter
EOT 104H End of Transmission PC to VS-900MF

TOA VS-900 Programmer’s Guide
10
3. Log Data Request
The data string below requests Log Data from Exchange #1 (only). After the Log Data Request has been
sent, the Log Data string will be sent to the PC in the format shown on the next page (Example 4. Log
Data Format).
Field Name Length
(Bytes)
Value Description Direction
DLE 110H Delimiter
ENQ 105H Enquiry VS-900MF to PC
DLE 110H Delimiter
ACK 106H Acknowledge PC to VS-900MF
DLE 110H Delimiter
STX 102H Start Of Text
Log Data 14FH Log Data Request
All Exchanges 230H 30H
ON/OFF Status 16 31H 30H 30H 30H 30H 30H
30H 30H 30H 30H 30H 30H
30H 30H 30H 30H
Exchange #1 Log Data
31H = “On" 30H=”Off”
DLE 110H Delimiter
ETX 103H End Of Text
BCC 15DH Block Check Character*
VS-900MF to PC
DLE 110H Delimiter
ACK 106H Acknowledge PC to VS-900MF
DLE 110H Delimiter
EOT 104H End of Transmission VS-900MF to PC
4. Log Data Format
This example illustrates five data strings that occur when “Normal” priority Sub-station #105 initiates a call
to Master Station #200 at 16:37:23.
Call From Normal Sub-station
Field Name Length
(Bytes)
Value Description Direction
DLE 110H Delimiter
ENQ 105H Enquiry VS-900 to PC
DLE 110H Delimiter
AC
K
106H Acknowledge PC to VS-900
DLE 110H Delimiter
STX 102H Start Of Text
Log Data 16FH Log Data
Exchange # 230H 31H Exchange # “01”
Time (HH:MM:SS) 631H 36H 33H 37H 32H 33H Time: “16:37:23"
Line #1 631H 30H 35H 20H 20H 20H Calling Station # “105”
Line #2 632H 30H 30H 20H 20H 20H Called Station # “200”
Line #3 620H 20H 20H 20H 20H 20H Not Used (Blank)
Line #4 620H 20H 20H 20H 20H 20H Not Used (Blank)
Status # 230H 31H “01” (Call from Normal
Sub-station)
DLE 110H Delimiter
ETX 103H End Of Text
BCC 178H Block Check Character
VS-900MF to PC
DLE 110H Delimiter
AC
K
106H Acknowledge PC to VS-900
DLE 110H Delimiter
EOT 104H End of Transmission VS-900MF to PC

TOA VS-900 Programmer’s Guide
11
Station Call Reception
Field Name Length
(Bytes)
Value Description Direction
DLE 110H Delimiter
ENQ 105H Enquiry VS-900 to PC
DLE 110H Delimiter
AC
K
106H Acknowledge PC to VS-900
DLE 110H Delimiter
STX 102H Start Of Text
Log Data 16FH Log Data
Exchange # 230H 31H Exchange # “01”
Time (HH:MM:SS) 631H 36H 33H 37H 32H 33H Time: “16:37:23"
Line #1 632H 30H 30H 20H 20H 20H Master Station # “200”
Line #2 620H 20H 20H 20H 20H 20H First Waiting station #
(Blank)
Line #3 620H 20H 20H 20H 20H 20H Not Used (Blank)
Line #4 620H 20H 20H 20H 20H 20H Not Used (Blank)
Status # 230H 35H “05” (Station call
reception)
DLE 110H Delimiter
ETX 103H End Of Text
BCC 168H Block Check Character
VS-900MF to PC
DLE 110H Delimiter
AC
K
106H Acknowledge PC to VS-900
DLE 110H Delimiter
EOT 104H End of Transmission VS-900MF to PC
Call Operation Completion
Field Name Length
(Bytes)
Value Description Direction
DLE 110H Delimiter
ENQ 105H Enquiry VS-900 to PC
DLE 110H Delimiter
AC
K
106H Acknowledge PC to VS-900
DLE 110H Delimiter
STX 102H Start Of Text
Log Data 16FH Log Data
Exchange # 230H 31H Exchange # “01”
Time (HH:MM:SS) 631H 36H 33H 37H 32H 37H Time: “16:37:27"
Line #1 632H 30H 30H 20H 20H 20H Master Station # “200”
Line #2 631H 30H 35H 20H 20H 20H Called Station # “105”
Line #3 620H 20H 20H 20H 20H 20H Not Used (Blank)
Line #4 620H 20H 20H 20H 20H 20H Not Used (Blank)
Status # 230H 39H “09” (Call operation
completion)
DLE 110H Delimiter
ETX 103H End Of Text
BCC 174H Block Check Character
VS-900MF to PC
DLE 110H Delimiter
AC
K
106H Acknowledge PC to VS-900
DLE 110H Delimiter
EOT 104H End of Transmission VS-900MF to PC

TOA VS-900 Programmer’s Guide
12
Start of Normal Conversation
Field Name Length
(Bytes)
Value Description Direction
DLE 110H Delimiter
ENQ 105H Enquiry VS-900 to PC
DLE 110H Delimiter
ACK 106H Acknowledge PC to VS-900
DLE 110H Delimiter
STX 102H Start Of Text
Log Data 16FH Log Data
Exchange # 230H 31H Exchange # “01”
Time
(HH:MM:SS)
631H 36H 33H 37H 32H
37H
Time: “16:37:27"
Line #1 632H 30H 30H 20H 20H
20H
Calling Station # “200”
Line #2 631H 30H 35H 20H 20H
20H
Called Station # “105”
Line #3 620H 20H 20H 20H 20H
20H
Hold Station # (Blank)
Line #4 620H 20H 20H 20H 20H
20H
Not Used (Blank)
Status # 231H 30H “10” (Start of normal
conversation)
DLE 110H Delimiter
ETX 103H End Of Text
BCC 174H Block Check Character
VS-900MF to PC
DLE 110H Delimiter
ACK 106H Acknowledge PC to VS-900
DLE 110H Delimiter
EOT 104H End of Transmission VS-900MF to PC
Normal Call Termination
Field Name Length
(Bytes)
Value Description Direction
DLE 110H Delimiter
ENQ 105H Enquiry VS-900 to PC
DLE 110H Delimiter
AC
K
106H Acknowledge PC to VS-900
DLE 110H Delimiter
STX 102H Start Of Text
Log Data 16FH Log Data
Exchange # 230H 31H Exchange # “01”
Time (HH:MM:SS) 631H 36H 33H 37H 32H 38H Time: “16:37:28"
Line #1 632H 30H 30H 20H 20H 20H Calling Station # “200”
Line #2 631H 30H 35H 20H 20H 20H Called Station # “105”
Line #3 620H 20H 20H 20H 20H 20H Not Used (Blank)
Line #4 620H 20H 20H 20H 20H 20H Not Used (Blank)
Status # 233H 32H “32” (Normal call
termination)
DLE 110H Delimiter
ETX 103H End Of Text
BCC 173H Block Check Character
VS-900MF to PC
DLE 110H Delimiter
AC
K
106H Acknowledge PC to VS-900
DLE 110H Delimiter
EOT 104H End of Transmission VS-900MF to PC

TOA VS-900 Programmer’s Guide
13
Summarized version of the above Log Data Format example:
(Shaded areas represent responses required from the PC, all numbers are
in Hex)
Call From Normal Sub-station
10 05 10 06 10 02 6F 30 31 31 36 33 37 32 33 31 30 35 20 20 20 32 30 30
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 30 31 10 03 78 10 06 10 04
Station Call Reception
10 05 10 06 10 02 6F 30 31 31 36 33 37 32 33 32 30 30 20 20 20 20 20 20
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 30 35 10 03 68 10 06 10 04
Call Operation Completion
10 05 10 06 10 02 6F 30 31 31 36 33 37 32 37 32 30 30 20 20 20 31 30 35
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 30 39 10 03 74 10 06 10 04
Start of Normal Conversation
10 05 10 06 10 02 6F 30 31 31 36 33 37 32 37 32 30 30 20 20 20 31 30 35
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 31 30 10 03 7C 10 06 10 04
Normal Call Termination
10 05 10 06 10 02 6F 30 31 31 36 33 37 32 38 32 30 30 20 20 20 31 30 35
20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 33 32 10 03 73 10 06 10 04
Decimal equivalent of above:
Call From Normal Sub-station
016 005 016 006 016 002 111 048 049 049 054 051 055 050 051 049
048 053 032 032 032 050 048 048 032 032 032 032 032 032 032 032
032 032 032 032 032 032 032 048 049 016 003 120 016 006 016 004
Station Call Reception
016 005 016 006 016 002 111 048 049 049 054 051 055 050 051 050
048 048 032 032 032 032 032 032 032 032 032 032 032 032 032 032
032 032 032 032 032 032 032 048 053 016 003 104 016 006 016 004
Call Operation Completion
016 005 016 006 016 002 111 048 049 049 054 051 055 050 055 050
048 048 032 032 032 049 048 053 032 032 032 032 032 032 032 032
032 032 032 032 032 032 032 048 057 016 003 116 016 006 016 004
Start of Normal Conversation
016 005 016 006 016 002 111 048 049 049 054 051 055 050 055 050
048 048 032 032 032 049 048 053 032 032 032 032 032 032 032 032
032 032 032 032 032 032 032 049 048 016 003 124 016 006 016 004
Normal Call Termination
016 005 016 006 016 002 111 048 049 049 054 051 055 050 056 050
048 048 032 032 032 049 048 053 032 032 032 032 032 032 032 032
032 032 032 032 032 032 032 051 050 016 003 115 016 006 016 004

VS-900 Remote Control and Monitoring Protocol
14
Appendix A - Log Status Messages
Status # (2 Bytes)
Dec Hex
Description Line 1 Line 2 Line 3 Line 4
01 30H 31H Call from Normal sub-station. Calling station # Called station # - -
02 30H 32H Call from Emergency sub-station. Calling station # Called station # - -
03 30H 33H Call from Master Station (Telephone Master) Calling station # Called station # - -
04 30H 34H Call from C/O line
“Axxy " ("xx" is exchange #, and "y" is
C/O line # 1 – 2
C/O line # Called station # - -
05 30H 35H Master Station (Telephone Master) reception of a
call from Normal sub-station
Master Station # First waiting station # - -
06 30H 36H Master Station (Telephone Master) reception of a
call from Emergency sub-station
Master Station # First waiting station # - -
07 30H 37H Master Station (Telephone Master) reception of a
call from other Master Station (Telephone Master)
Master Station # First waiting station # - -
08 30H 38H Master Station (Telephone Master) reception of a
C/O line call
Master Station # First waiting station # - -
09 30H 39H Call operation completion at Master Station
(Telephone Master)
Master Station # Called station # - -
10 31H 30H Start of Normal conversation Calling station # Called station # Hold station # -
11 31H 31H Start of Emergency conversation Calling station # Called station # Hold station # -
12 31H 32H Start of C/O line conversation Calling station # Called station # Hold station # -
13 31H 33H Automatic response to an incoming C/O line call
(direct-in dial)
“Axxy " ("xx" is exchange #, and "y" is
C/O line # 1 – 2
C/O line # - - -
14 31H 34H Start of Individual-zone or All-zone Paging
"pagxx " ("xx" is paging zone #01 - 19)
Calling station # Paging # - -
15 31H 35H Start of Emergency All-zone Paging
"pagxx " ("xx" is paging zone #01 - 19)
Calling station # Paging # - -
16 31H 36H Start of External Broadcast activation
"chx " ("x" is the external line # 1 - 4)
Activated input # Paging # - -
17 31H 37H Connection of Scan Monitor Operating station # Monitored station # - -
18 Not used
19 31H 39H Start of Conference call Call originating station # - - -
20 32H 30H Connection of Conference call Call originating station # Participant station # Participant station # -
21 32H 31H Start of Emergency Conference call Call originating station # - - -

VS-900 Remote Control and Monitoring Protocol
15
22 32H 32H Connection of Emergency Conference call Call originating station # Participant station # Participant station # Participant station #
23 32H 33H Automatic Call Forward log Station # to transfer a
call
Station # a call is
transferred to
--
24 -
29
Not Used
30 33H 30H Call termination by disappearance of waiting
stations. Displayed when reception mode is
switched to standby mode.
Master Station # - - -
31 33H 31H Call termination before dialing completion Operating station # Called station # - -
32 33H 32H Normal call termination Calling station # Called station # Hold station # -
33 33H 33H Receiving C/O line call interruption
“Axxy " ("xx" is exchange #, and "y" is
C/O line # 1 - 2
C/O line # - - -
34 33H 34H Paging termination Calling station # Paging # - -
35 33H 35H Emergency Paging termination Calling station # Paging # - -
36 33H 36H Termination of external input broadcast.
"chx " ("x" is the external line # 1 - 4)
Activated input # Paging # - -
37 33H 37H Termination of Scan Monitor Operating station # Monitored station # - -
38 33H 38H Termination of Conference Call originating station # Participant station # Participant station # -
39 33H 39H Termination of Emergency Conference Call originating station # Participant station # Participant station # Participant station #
40 34H 30H Line disconnection. Displayed when only a single
line for call transfer or call-back is disconnected.
Disconnected station # - - -
41 34H 31H Call termination due to the ringing repetition limit
(No-Answer)
Calling station # - - -
42 34H 32H Call termination due to the time limit (conversation,
C/O and Paging)
Calling station # Called party station # Hold station # -
43 34H 33H Call termination (at the called station). Displayed
when a received call disappears.
Calling station # Called party station # - -
44 34H 34H Forced call termination (Priority) Calling station # Called party station # Hold station # -

VS-900 Remote Control and Monitoring Protocol
16
Appendix B - ASCII Character Codes