ZETRON Model 16 - Page 71

SECTION 4D - HAYES COMPATIBLE MODEM INTERFACE
AT Command Summary
The following information is provided as a reference and is not necessarily
a complete description of the AT command set.
AT AT command(s) follow
A answer an incoming call and attempt to establish a connection
А/ repeat previous command string (do not follow with <CR>)
В signal protocol selection
BO
CCITT V.22
B1 Bell 212A
&C carrier detect signal
&C0
carrier detect signal active always
&C1
carrier detect signal follows carrier
&D
DTR monitoring
&D0
modem ignores DTR
&D1
modem monitors for DTR
D
dial command
E
echo received commands control
EO
commands are not echoed
El
commands are echoed
H
hook (telephone line state)
HO
on hook
HI
off hook
I modem status inquiry
10 display ID
11
display rom chksum
L
speaker volume
L0 low
LI low
L2
med i urn
L3 high
M
speaker control
MO off always
Ml on until connect
М2 on always
М3
on except when dialing or when carrier detected
0
returns to
online state after an escape while connected
00
re-establish online state
01 re-establish online state but re-adjust for phone
phone line conditions (2400 baud only)
P
pulse dialing enabled
Q
quiet mode, controls sending responses to received commands
Q0
command responses are displayed
Q1
command responses are not displayed
S read or write to the S-Registers
Sr?
read value stored in register r
Sr=n
assign value n to register r
T tone dialing enabled
V response format
VO
respond with numeric codes
VI
respond with verbal codes
X response convention
xo
minimum responses used (don't use with Model 16)
XI
minimum responses plus transmission speed identifier
X2
same as XI but waits for dial tone before dialing
X3
same as XI but BUSY, N0 ANSWER, and tone detection
messages are also displayed
X4
same as X3 but waits for dial tone before dialing
Y
long space disconnect
Y0
disabled
Y1
transmits 4 seconds of space before disconnect
Z reset modem
4D-7