Radionics D6500 - Link Test

D6500 Computer Interface Manual
74-05313-000-G 10/16/97 Page 59 © 1988-1997 Radionics, Inc.
Switch Line Card
The automation system, or other device, must send the command shown below to switch from a listen in
session on one line card to the line card specified.
!Ln<CR>
n
- line card number
L# LISTEN SWITCHED
appears in the D6500 display and prints at D6500 printers as programmed.
Stop Listening
The automation system, or other device, must send the command shown below to stop a listen in session on
the line card specified.
!Kn<CR>
n
- line card number
L# LISTEN STOP
appears in the D6500 display and prints at D6500 printers as programmed.
All Input Commands generate an ASCII text type message to the automation port. The D6500 and SIA
Automation output formats for these Input Commands are shown in Table 7.
4.6 Link Test
The Link test is used to test the connection between the D6500 Receiver and the automation system to which it
is connected.
Input devices, such as automation systems, can cause the D6500 to generate a Link Test message. The Link
Test message is only generated when the D6500 has received a request from the input device, such as an
automation system (SIA Mode Only). The Link Test message, as defined by SIA, is a Null Message.(SIA Mode
Only)
The D6500 can automatically generate this message at intervals of 60 seconds (6500 Mode Only). To use this
feature, 6500:MPU
Link Test
must be programmed
Yes
.
To request a Link Test message from the D6500, the automation system must send an Ambiguous Null (see
example below).
Example: SIA Link Test
Automation sends Ambiguous Null to the D6500:
<Header>
| ---------------------------------------------------------------------- |
<lf> <checksum> <tab> <0000> <Receiver #> <Line#> <[]> <CR>
If the D6500 receives the Ambiguous Null message, it will respond with the Link Test (Null Message):
<Header>
| ---------------------------------------------------------------------- |
<lf> <checksum> <tab> <1234> <Receiver #> <Line#> <[]> <CR>
NOTE
The difference between the Ambiguous Null and the Null messages is the Sequence number. The
Sequence number is the group of four digits between the tab character and the Receiver#. The
Sequence number is always greater than zero except in the Ambiguous Null message.
For more information on SIA Output, see Section 4.3 SIA Mode Messages.