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\H
+H
HP -ENQ/ACK protocol Control
Commands: \HO, \H1, \H2
In the HP ENQ/ACK software protocol one part will be set-up as
host, and the other as terminal. The protocol will prevent the
host from sending data faster than the terminal is capable of
receiving.
Host sends ENQ (05H) every 80th character to terminal.
Transmission is stopped until ACK (06H) is received or until
time-out (5s). Terminal sends ACK when ENQ is received if
terminal is ready to receive. If buffers are full, ACK is sent when
space is available.
| ENQ/ACK Modem emulates host
- [No ENQ/ACK (Default)
Full/half duplex
Commands: +H0, +H1, +H2, +H3
« | Full duplex (V.22)
4) V. 23 with back channel.
= | The originator transmits at 75 bit/s and
"a receives at 1200.
"|The answering modem transmits at 1200 bit/s
and receives at 75 bil/s.
"= "1 Full duplex on leased line 4-wire, V.23, 1200
"Lor 600 bps.
@" A setup for the +H3 command will be:
AT+M0%B12%G1+H3+W18&W
To use the standard 1200/75, the originator must issue the
AT+M1+H1 postal command at 1200 bps from DTE. The
answering modem automatically detects V.23 mode.
Connect messages in V.23 1200/75:
CONNECT 1200
3-22
LZTR104006 R1.00
Zat 14.4/14.4-7 and Zat 19.2/19.2-7
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