Page 41 of 59
RESPONSE TO ALL COMMANDS
The
v
8
Paging System
will respond immediately to all commands, including Paging Message commands, Setup
Commands, and Status Commands, by echoing the Paging Message command back to the PC, and appending the
echoed command with a status message in one of the following formats:
<SOH><ACK>V..V,QQ,D,C,II<EOT>
The
ACK
response is sent by the paging encoder to the host system immediately following a command if the command
was understood by the paging encoder.
<SOH><NAK>EE<EOT>
The
NAK
response is sent by the paging encoder to the host system immediately following a command if the command
was not understood by the paging encoder or if certain errors occur.
<SOH>
(Hex code 01) is used to mark the start of a message.
<ACK>
(Hex code 06) is used to indicate acknowledgement of valid reception of a command from the host
system.
V..V
Alphanumeric string that indicates the version number of the firmware in the paging encoder. The version
number is followed by a comma character.
A one to two numeric character string that indicates the quantity of paging messages that have been
received by the paging encoder and not yet transmitted (Input Queue).
The
value is followed by a comma character. This parameter should be monitored if you intend to use software
handshaking between your paging control software and the paging encoder. The paging encoder Input Queue overflows if
the
value tries to exceed 14. As an example, with software handshaking, your software should stop sending data at a
value of 12 and resume sending data when the
value reaches 10 or less. You can query the size of the Input
Queue by submitting a Status Command, described on the following pages.
D
Numeric character that indicates whether the carrier detect circuit in the paging encoder is currently
detecting a carrier signal or not. Valid values are:
0 =
Carrier Signal Not Detected
1 =
Carrier Signal Detected
Note:
The carrier detect signal status is passed to the PC whether or not the paging encoder has been programmed to
avoid transmitting when a carrier signal has been detected (see Programming Command below).
C
A single numeric value used to indicate the
On/Off
state of the Carrier Detect mode. The numeric
character is followed by a comma.
Valid values
(C)
are:
0 =
Off
1 =
On
II
A two hexadecimal digit value that is reserved for future use.
WaveWare Interface Specifications continued on next page…
