AN93

 

 

Table 86. EM In-Band Commands and Statuses (Continued)

 

 

 

 

 

 

 

 

 

Command–

Hex

 

 

Supported

Supported

 

Transmit Direction

Receive Direction

in

 

in Framed

 

Indicator pair

Code

Transparent

 

 

 

Submode

 

 

 

 

 

Submode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Retrain/Rate Reneg com-

 

 

 

 

 

 

pleted, following octets

 

 

 

 

 

 

<tx><rx> indicate tx and rx

 

 

 

 

 

 

rates.

 

 

 

 

 

 

0x20–1200 bps

 

 

 

 

 

 

0x21–2400 bps

 

 

 

 

 

 

0x22–4800 bps

 

 

 

 

 

 

0x23–7200 bps

 

 

 

 

 

 

0x24–9600 bps

 

 

 

<EM><rate>

0xBE

not supported

0x25–12 kbps

Yes

Yes

 

0x26–14.4 kbps

 

 

 

 

 

 

 

 

 

 

0x27–16.8 kbps

 

 

 

 

 

 

0x28–19.2 kbps

 

 

 

 

 

 

0x29–21.6 kbps

 

 

 

 

 

 

0x2A–24 kbps

 

 

 

 

 

 

0x2B–26.4 kbps

 

 

 

 

 

 

0x2C–28.8 kbps

 

 

 

 

 

 

0x2D–31.2 kbps

 

 

 

 

 

 

0x2E–33.6 kbps

 

 

 

 

 

 

 

 

 

 

Notes:

1. U87 [10] = 1 Can be used to limit the transparency characters in the receive direction, to these four cases only.

2. The actual value represented in <octnum0><octnum1> = (octnum0 / 2) + (octunum1 x 64)

3. <EM><0x45> indicates that an unrecognized <EM> command was sent to the modem.

In addition, a common Point-of-Sale V.22 Fast Connect Handshake Protocol (with transparent HDLC) requires these additional settings:

Table 87. Fast Connect Settings

AT+MS = V22

V22 Protocol

 

 

AT:U7A,3

Set Fast Connect, Transmit

 

HDLC Flags instead of Marks

 

during handshake negotiation.

 

 

Rev. 1.3

129

Page 129
Image 129
Silicon Laboratories SI2494/39 manual Fast Connect Settings, Command, Supported Transmit Direction Receive Direction