User manual

Appendix A Hayes Commands
Page 59 © January 2011
(ASCII code)
S3
0-127
Carriage Return Character
Normally 13 = <CR>
S4
0-127
Line Feed Character
Normally 10 = <LF>
S5
0-127
Back Space Character
Normally 8 = <BS>
S6
0-255
Link Check Timer
Units Seconds. 0 disables. How frequently
to send a “Link Check” message. Usually
set less than the timeout set by the
AT\Tcommand. Default 0.
S7
1-255
Number of Connection
attempts
How many times to attempt a connection
after an ATD command. Default 5.
S8 0-255 Test Timer Units Seconds – How long to run tests
(AT&Tx). Default 0 (no time-out).
S9 0-255 Module Receive Level Units (-)dBm - RSSI indication of last
received message
S10 0-255 DTR Loss Detection Time Units 10 milliseconds
S11 0-255 Not used
S12 read-
only
Command Mode Diagnostic Reason module last returned to command
mode, i.e. connection lost.
S12 = 0 Reset (ATZ or Power Up).
S12 = 1
Escape sequence (“+++”)
S12 = 2
DTR lowered.
S12 = 3
No ACK from remote module after connected.
S12 = 4
Activity timer timed out.
S12 = 5
No response to dial request to remote module.
S12 = 6
“BUSY” response from remote module on dial request.
S12 = 7
Character received from host while attempting to connect
S12 = 8
Hang-up from remote module.
S13
0-3
Country code for radio (not
user configurable)
0 = US/Canada
1 = Australia
2 = New Zealand
3 = Europe
S14
0-255
Max Data Packet size
transmitted by radio
Max Packet size = 20 + (S14 x 2). Default
255 = 530 bytes
S15
0-7
Not Used