muLOGIC LLM-336 User manual

User Guide
Issue 1.8
Feb. 2016
Copyright 2008-2016
MuLogic B.V.
Plesmanstraat 58d
3905 KZ Veenendaal, The Netherlands
LLM-336
VOICE-BAND LEASED
LINE MODEM
(HARDWARE REVISION 2)

LLM–336 Leased Line Modem
Compliances
Public Leased line operation
•2-wire operation (A2O, A2S): ES 203 021
•4-wire operation (A4O, A4S): ES 203 021
CE Compliance
•EMC: Directive 2004/108/EC (EN 55022, EN55024)
•Safety: Directive 2006/95/EC (EN 60950)
The LLM-336 complies with EMC directive 2004/108/EC and is classified for
use in Residential areas. Test standard: EN 55022 Class B
The LLM-336 also complies with the Immunity standard for ITE equipment
EN 55024 with the applicable test levels increased to levels compatible with
Industrial standards (ref. EN 61000-6-2).
About this user guide
Although this user guide was written with greatest possible care, omissions and
errors cannot be precluded. MuLogic b.v. accepts no liability for any
inaccuracies that may be found.
However, if you have comments or suggestions about this guide, please don’t
hesitate to contact us in order to help us to improve our product documentation.
Tel: [phone]
Fax: [phone]
E-mail: [e-mail]
Website: www.mulogic.com
Important note:
This user guide applies to LLM-336 modems with hardware revision 2.
Modems with hardware revision 2 are marked H/W : rev.2 on the serial number
label.
© MuLogic b.v. 2008..2016
This guide is for information purposes only. All design characteristics,
specifications, etc. are subject to change without notice.
No part of this publication may be reproduced, transmitted, transcribed, stored
in a retrieval system or translated into any human or computer language in any
form by any means without the prior permission of MuLogic b.v.
Issue No 1.8 (Feb. 2016)

Declaration of Conformity
We, Mulogic b.v., Olivier van Noortstraat 4, 3124LA, Schiedam, the Netherlands,
herewith declare that the products:
Type of product
Model
Hardware Revision
Panel/DIN-Rail modem
LLM-336D
Rev. 2
Standalone modem
LLM-336S
Rev. 2
Rack mounted modem
LLM-336R
Rev. 2
are in conformity with the European Harmonised Standards as published in the
Official Journal of the EC, Issue C225 (2007-09-25) following the provisions of the
directives:
No.
Title
2004/108/EC
Electromagnetic Compatibility (EMC)
2006/95/EC
Electrical Safety (Low voltage directive)
The compliance of the product has been based on the following standards:
No.
Title
Issue
EN 55022
Emission limits in residential environments
2006
EN 55024
Immunity of IT equipment
1998+A1+A2
EN 60950
Electrical safety of IT equipment
2002
EN 61000-6-2
Immunity in Industrial environments
2001
The last two digits of the year in which the CE marking was affixed: 08
February 26, 2008
J.H.J Beck
Managing Director
This Declaration of Conformity is suitable to the European Standard EN 45014: General Criteria for
supplier's Declaration of Conformity.
The basis for the criteria has been found in international documentation, particularly in ISO/IEC, Guide 22,
1982: Information on manufacturer's Declaration of Conformity with standards or other technical
specifications.

Leased Line Data Modem LLM-336 User Guide – Hardware Details and Installation
Page 1-1
1
Introduction
LLM-336
The MuLogic LLM-336 is a voice-band modem for reliable data communication
over analogue leased lines, conditioned and unconditioned copper cable, or for
operation in combination with radio equipment.
The LLM-336 is available in two versions of standalone modem or as rack card.
The rack card conforms to the CEPT T/CD 01-14 type I specification, which
enables easy integration in various hardware environments.
Up to 16 rack cards can be mounted in a MuLogic UCF-16.3 or MCF-16.3 card
frame. The lower density UCF3.1 housing can house up to 3 modems.
The modem is designed to serve a vast majority of applications. It can be used
on 2-wire and 4-wire lines, in point-to-point and multi-point configurations and
complies with emissions/immunity standards for both industrial and residential
use.
The LLM-336 offers synchronous data rates up to 33.6 kbit/s and supports
asynchronous port rates of up to 115.2 kbit/s.
For asynchronous applications the LLM-336 modems are equipped with an
RS232C and an RS485 interface port.
The LLM-336 is available in the following hardware versions:
•LLM-336D: Small plastic housing suited for panel or Din-rail mounting.
•LLM-336R: Modem card for MuLogic UCF and MCF card frames.
•LLM-336S: Modem card in metal housing for shelf or desktop use.
On the LLM-336D the RS485 port is standard. For LLM-336R and LLM-336S
the RS485 port is available as an option.

User Guide – Hardware Details and Installation Leased Line Data Modem LLM-336
Page 1-2
Features
•Supported modem standards
Full Duplex operation (ITU-T)
V.34 2400 up to 33600 bit/s
V.32bis 7200, 12000 and 14400 bit/s
V.32 4800 and 9600 bit/s
V.22bis 1200 and 2400 bit/s
V.22 1200 bit/s
V.21 300 bit/s
Full Duplex operation (Bell)
212A 1200 bit/s
103 300 bit/s
Switched carrier and multi-point operation (ITU-T)
V.33 12000 and 14400 bit/s (half-duplex only)
V.29 4800, 7200 and 9600 bit/s (half-duplex only)
V.27bis 2400 and 4800 bit/s (half-duplex only)
V.23 1200 bit/s (half-duplex only)
•Operation over 2-wire and 4-wire leased lines or dry copper lines.
•Point-to-point and multi-point/multi-drop operation.
•Switched line impedance for multi-drop operation on dry copper wire.
•Operating modes selected by means of dipswitches.
Up to 40 modes are factory pre-programmed.
•Error Correction and Data Compression for reliable transmission and
throughput improvement of asynchronous data. (ITU-T V.42bis and V.44)
•Automatic Carrier Control (controlled by transmitted data) for half
duplex operation without RTS control.
•Programmable transmit level, ranging from –10 to – 30dBm @600Ω
•Programmable receive carrier detect thresholds.
•Both RS232C and RS485 interfaces supported on LLM-336D.
•RS485 optional for LLM-336R and LLM-336S.
•Data buffers for asynchronous port rates independent from line rate.
•Both 10-bit and 11-bit asynchronous data formats supported.
•Transparent asynchronous communication up to 9600 bit/s

Leased Line Data Modem LLM-336 User Guide – Hardware Details and Installation
Page 2-1
2
Hardware Details and Installation
Hardware versions
The LLM-336 is available in the following hardware versions:
•LLM-336D: Small plastic housing suited for panel or Din Rail mounting.
•LLM-336R: Modem card for MuLogic UCF and MCF card frames.
•LLM-336S: Modem card in metal housing for shelf or desktop use.
Fig. 1 LLM-336D
The front panel of the LLM-336D contains five LEDs that indicate the status of
the most important interface signals and modem status.
Fig. 2 LLM-336R, LLM-336S
Front panel layout
of LLM-336D

User Guide – Hardware Details and Installation Leased Line Data Modem LLM-336
Page 2-2
The front panels of the LLM-336R and LLM-336S contain eight LEDs that
indicate the status of the interface signals and modem status.
Front panel LED Indicators
The LED indicators of the LLM-336, display the real-time status of the modem
and the key DTE interface signals. In case a communication problem occurs,
these LEDs can help you determine the cause of the problem.
LED
ITU-T
DIN
Description
PWR
-
-
Indicates that the modem is powered on and
functions correctly.
DSR
106
M1
(Not present on LLM-336D)
DSR on, indicates that the modem is ready for
operation. DSR is off when the modem is in
configure mode.
DTR
108
S1
Follows the state of the DTR interface signal
coming from the connected DTE. The DTE
(attached device) activates the DTR to signal that
its serial port is ready for communication.
TxD*
103
D1
Flashes when the modem receives data from the
connected DTE.
RxD*
104
D2
Flashes when the modem receives data from the
remote modem.
RTS
105
S2
(Not present on LLM-336D)
Follows the state of the RTS interface signal
coming from the connected DTE.
At half-duplex operation, the DTE activates RTS to
signal that it is ready to send data to the modem.
At full-duplex operation, the DTE activates RTS to
signal that it is ready for receiving data from the
modem. (Circuit 133 mode).
CTS
106
M2
(Not present on LLM-336D)
Follows the state of the modem CTS interface
signal. The modem activates CTS to signal that it
is ready to receive data from the DTE.
DCD
109
S5
Follows the state of the modem DCD interface
signal. The modem activates DCD to signal that a
valid carrier is received from the remote modem.
Notes:
At high data rates, short bursts of data may not be visible at the TxD and RxD
LEDs
DTE stands for Data Terminal Equipment, a generic expression for computer,
RTU or any terminal equipment connected to the modem via the serial port.
When the RS485 interface is used, only the TxD and RxD signals are controlled
Front panel layout
of LLM-336R and
LLM-336S

Leased Line Data Modem LLM-336 User Guide – Hardware Details and Installation
Page 2-3
Switches and jumpers
At the LLM-336D, the dipswitches are located at the side of the housing. For
reaching the RS485 jumper inside the LLM-336D housing, release the 4 screws
at the bottom of the housing.
Fig. 3 Switches of the LLM-336D
Fig. 4 Switches and RS485 jumper of LLM-336D
For reaching the dipswitches and RS485 jumper of the LLM-336R or LLM-336S,
the modem card must first be removed from the card frame or desktop housing
by releasing the front panel screws.
Fig. 5 Switches and RS485 jumper of LLM-336S and LLM-336R

User Guide – Hardware Details and Installation Leased Line Data Modem LLM-336
Page 2-4
This switch can be used to reset or restart the modem.
This jumper is used to select 2-wire RS485 or 4-wire RS485/422.
When the jumper is in position 1-2, both 2-wire and 4-wire Rx terminals can
receive RS485 data. When the jumper is in position 2-3 only the 4-wire Rx
terminals can receive data.
JP1
Pos 1-2*
Pos 2-3
2-wire RS485 4-wire RS485/RS422
Note: JP1 Position 1-2 can be used for both 2-wire and 4-wire RS485
Switch
ON
OFF
DS1.1-DS1.6 See table 3, operating modes
DS1.7 Configure mode Modem mode
DS1.8 S92 Tx Level* S91 Tx Level*
Note: See page 3-12
Switch
ON
OFF
DS2.1
4-wire operation
2-wire operation
DS2.2
2-wire operation
4-wire operation
DS2.3
4-wire Rx line terminated with 600 Ω
4-wire Rx line terminated with 5000 Ω
DS2.4
4-wire operation
2-wire operation
DS2.5
Controlled impedance (note 1)
Fixed impedance
DS2.6
Reserved
Reserved (keep Off)
DS2.7
Originate mode (note 2)
Answer mode
DS2.8
Monitor speaker always on (note 3,4)
Monitor speaker off
Line type
DS2.1
DS2.2
DS2.3
DS2.4
DS2.5
DS2.6
2-wire, fixed 600Ω
Off
On
Off
Off
Off
Off
4-wire, fixed 600Ω
On
Off
On
On
Off
Off
2-wire, controlled impedance
Off
On
Off
Off
On
Off
4-wire, controlled Tx impedance
On
Off
Off
On
On
Off
Table 2. Line connection modes
Note 1. Controlled impedance is used for multi-drop operation on a non-
conditioned copper cable. In 2-wire controlled impedance mode, when
transmitting (RTS on), the impedance is 600 Ω .
When receiving (RTS off), the impedance is 5000 Ω .
In 4-wire controlled Tx impedance mode only the impedance of the TX pair is
switched. The RX impedance shall be set to “high” by setting DS2.3 to OFF.
Note 2. For V.34, V.32(bis), V22(bis and V.21) operation one modem must be
set to originate mode and the other to answer mode.
Note 3. The monitor speaker can be switched On or Off during operation.
Note 4. In 4-wire line connection mode, the monitor speaker only makes the
receive signal audible.
SW1, Reset Switch
JP1, RS485 mode
DS1, Dip-switch 1
DS2, Dip-switch 2

Leased Line Data Modem LLM-336 User Guide – Hardware Details and Installation
Page 2-5
Operating modes
Note: Profiles 2..40 are factory pre-set. (see notes on page 2-6)
Consult chapter 3 if none of these operating modes suit your application.
Operating modes
DS1.1 DS1.2 DS1.3 DS1.4 DS1.5 DS1.6
0
User Profile 0
Off
Off
Off
Off
Off
Off
1
User Profile 1
On
Off
Off
Off
Off
Off
2
V.34 33.6 kbit/s sync. - Up to 9.6 kbit/s async.
Off
On
Off
Off
Off
Off
3
V.34 31.2 kbit/s sync. - Up to 9.6 kbit/s async.
On
On
Off
Off
Off
Off
4
V.34 28.8 kbit/s sync. - Up to 7.2 kbit/s async.
Off
Off
On
Off
Off
Off
5
V.34 26.4 kbit/s sync. - Up to 7.2 kbit/s async.
On
Off
On
Off
Off
Off
6
V.34 24.0 kbit/s sync. - Up to 4.8 kbit/s async.
Off
On
On
Off
Off
Off
7
V.34 21.6 kbit/s sync. - Up to 4.8 kbit/s async.
On
On
On
Off
Off
Off
8
V.34 19.2 kbit/s sync. - Up to 4.8 kbit/s async.
Off
Off
Off
On
Off
Off
9
V.34 16.8 kbit/s sync. - Up to 2.4 kbit/s async.
On
Off
Off
On
Off
Off
10
V.34 14.4 kbit/s sync. - Up to 2.4 kbit/s async.
Off
On
Off
On
Off
Off
11
V.34 12.0 kbit/s sync. - Up to 2.4 kbit/s async.
On
On
Off
On
Off
Off
12
V.34 9.6 kbit/s sync. - Up to 2.4 kbit/s async.
Off
Off
On
On
Off
Off
13
V.34 9.6 kbit/s asynchronous
On
Off
On
On
Off
Off
14
V.34 38.4 kbit/s async. with ErrCorr/Dcompr.
Off
On
On
On
Off
Off
15
V.34 19.2 kbit/s async. with ErrCorr/Dcompr.
On
On
On
On
Off
Off
16
V.34 9.6 kbit/s async. with ErrCorr/Dcompr.
Off
Off
Off
Off
On
Off
17
V32bis 14.4 kbit/s sync. Up to 2.4kbit/s async.
On
Off
Off
Off
On
Off
18
V32 9.6 kbit/s sync. Up to 2.4 kbit/s async.
Off
On
Off
Off
On
Off
19
V32 9.6 kbit/s asynchronous
On
On
Off
Off
On
Off
20
V.22bis 2.4 kbit/s asynchronous
Off
Off
On
Off
On
Off
21
V.22 1.2 kbit/s asynchronous
On
Off
On
Off
On
Off
22
V.21 300 bit/s asynchronous
Off
On
On
Off
On
Off
23
V.23 1.2 kbit/s async. Half Duplex RTS contr.
On
On
On
Off
On
Off
24
V.23 1.2 kbit/s async. Half Duplex ACC.
Off
Off
Off
On
On
Off
25
Reserved
On
Off
Off
On
On
Off
26
Reserved
Off
On
Off
On
On
Off
27
Reserved
On
On
Off
On
On
Off
28
V.27 4.8 kbit/s sync. Half Duplex RTS contr.
Off
Off
On
On
On
Off
29
V.27 2.4 kbit/s sync. Half Duplex RTS contr.
On
Off
On
On
On
Off
30
V.27 4.8 kbit/s async. Half Duplex RTS contr.
Off
On
On
On
On
Off
31
V.27 2.4 kbit/s async. Half Duplex RTS contr.
On
On
On
On
On
Off
32
V.29 9.6 kbit/s sync. Half Duplex RTS contr.
Off
Off
Off
Off
Off
On
33
V.29 7.2 kbit/s sync. Half Duplex RTS contr.
On
Off
Off
Off
Off
On
34
V.29 4.8 kbit/s sync. Half Duplex RTS contr.
Off
On
Off
Off
Off
On
35
V.29 9.6 kbit/s async. Half Duplex RTS contr.
On
On
Off
Off
Off
On
36
V.29 7.2 kbit/s async. Half Duplex RTS contr.
Off
Off
On
Off
Off
On
37
V.29 4.8 kbit/s async. Half Duplex RTS contr.
On
Off
On
Off
Off
On
38
V.29 9.6 kbit/s async. Half Duplex ACC
Off
On
On
Off
Off
On
39
V.29 4.8 kbit/s async. Half Duplex ACC
On
On
On
Off
Off
On
40
Reserved
Off
Off
Off
On
Off
On
Table 3. Operating modes. See notes on following page.
For the AT commands settings used for these profiles, refer to Appendix 1

User Guide – Hardware Details and Installation Leased Line Data Modem LLM-336
Page 2-6
For full-duplex operating modes 0 to 22, one modem must be set to Originate
mode and the other to Answer mode. See DS2.7 (page 2.4).
The default asynchronous format is 10-bit, which can be used for formats with
8 data bits-No parity (8-N-1) and 7 data bits plus parity (7-E-1 or 7-O-1).
For operation with 11-bit characters (8-E-1 or 8-O-1) consult pages 3-2 and 3-5.
Transparent asynchronous operation can be achieved by using synchronous
modes (e.g. modes 2 to 12).
In transparent asynchronous operation, the modem will accept all data formats
and rates up the maximum reliable rate which is approx. ¼ of the line rate.
Consult page 3-6 for further information.
In modes 14, 15 and 16, Error Correction and Data Compression for
asynchronous data is enabled. Consult page 3-6 for further information.
The default synchronous clock mode is: Tx clocks generated by the modem.
For external or slave clocking consult page 3-7.
For RTS-CTS delay times, ACC and multi-drop operation, refer to pages 3-8,
to 3-11.
In ACC modes, the duration of a transmission is limited to 10 seconds. This is
set by register S30. See page 3-10.
For Multi-drop operation refer to page 3-11
In operating modes 2 and 14, the modem will attempt to make a line connection
of 33.6kbit/s, or a lower rate when the signal quality is insufficient. For the other
operating modes, the data rate is fixed.
For diagnostics purposes, the modem can be switched to on-line command
mode. See chapter 4. The escape code and commands should be issued in
8-N-1 format. The data rate in asynchronous modes is equal to the speed of the
serial port. For synchronous modes, the command port rate is always 9600
bit/s.
Originate-Answer
mode selection
Asynchronous
10 or 11 bit
Characters
Error correction
Data compression
Synchronous
modes
Half-duplex
operation
Multi-drop
operation
Data rates
On-line Command
Mode

Leased Line Data Modem LLM-336 User Guide – Hardware Details and Installation
Page 2-7
Connectors
Fig. 5 LLM-336D
Fig. 6 LLM-336S, LLM-336R (IOC-PSV board)
1 = Not connected
2 = 4-wire transmit signal a (output)
3 = 4-wire receive signal a (input) / 2-wire receive-transmit a
4 = 4-wire receive signal b (input) / 2-wire receive-transmit b
5 = 4-wire transmit signal b (output)
6 = Not connected
Note: For the LLM-336R, the connector pin-out applies to the line connector of the
IOC-PSV interface board or the MCF-16.3 back plane.
Line Connector

User Guide – Hardware Details and Installation Leased Line Data Modem LLM-336
Page 2-8
PIN
V.24
Description
Data
Control
Clock
DTE
DCE
DTE
DCE
DTE
DCE
2
103
TxD – Transmitted data

3
104
RxD – Received data

4
105
RTS – Request to send

5
106
CTS – Ready for sending

6
107
DSR – Modem ready

7
102
Signal ground
8
109
DCD – Data Carrier Detect

15
114
INTCK – Internal transmit clock

17
115
RXCK – Receive clock

20
108.2
DTR – Data Terminal Ready

24
113
EXTCK – External transmit clock

25
142
TI -Test/Busy indicator

Table 4 V.24 interface signals
The operating power of the LLM-336D is supplied at pins 1 and 2 of the PWR/CI
screw terminal connector (see fig. 5). The voltage range depends on the model.
LLM-336D/VR1: 9-36Vdc, 11-28 Vac
LLM-336D/VR2: 18-60Vdc, 18-30Vac
Note: The power input of the LLM-336D is not polarised. You can connect DC
power in either direction.
Pins 3 and 4 of the screw terminal connector are reserved for future use and
customer-specific applications.
Pins 1 and 4 are RS485 “Rx” inputs used in 4-wire RS485 or RS422 mode.
Pins 2 and 3 are used for 2-wire RS485 or as “Tx” outputs in 4-wire RS485 or
RS422 mode.
Note 1: The RS485 output/inputs are not terminated.
When RS485 termination is needed, this should be applied externally.
Note 2: Jumper JP1 can be used to disable the receiver on pins 2 and 3.
Note 3: RS485Rx is for the modem’s TxData input. RS485 Tx is for RxData.
The operating power of the LLM-336S and LLM-336R (when used in UCF-16.3
or UCF-3.1) is supplied at either of the 2 screw terminal connectors (see fig. 6).
The remaining power connector can be used for linking the power to another
device. The operating voltage range depends on the model.
LLM-336S/VR1: 9-36Vdc, 19-26 Vac
LLM-336S/VR2: 18-60Vdc, 18-42Vac
Note: The power input of the LLM-336S is not polarised. You can connect DC
power in either direction.
RS232 Connector
Power pins
(LLM-336D)
CI pins
(LLM-336D)
RS485 connector
(LLM-336D)
Power connector
(LLM-336S/R)

Leased Line Data Modem LLM-336 User Guide – Hardware Details and Installation
Page 2-9
The LLM-336R card has a female 96pin ABC-row DIN 41612 connector.
Interface circuits printed bold are compliant with ITU-T V.24/V.28 or RS232C.
PIN
Row A
Row B
Row C
1
PGND
PGND
PGND
2
3
4
4-wire-Tx-A
5
6
4-wire-Tx-B
7
2-wire-TxRx-B
2-wire-TxRx-A
8
9
10
11
TxCLK (O)
TxD (I)
12
RxD (O)
13
RxCLK (O)
RTS (I)
14
CTS (O)
15
DSR (O)
16
DTR (I)
Reset (I, low active)
SGND
17
Com RxD (O) N/A
18
Com TxD (I) N/A
DCD (O)
19
RI (O) N/A
NMS TxD (I)
20
NMS RxD (O)
OH (O, low active)
21
EXCLK (I)
RS485 Rx +
22
TST (O)
RS485 TxRx +
23
Pwr (O, low active)
RS485 TxRx -
24
Address sel. A0
RS485 Rx -
Address sel. A2
25
Address sel. A1
Address sel. A3
26
27
~PSU-A-in
~PSU-A-in
~PSU-A-in
28
~PSU-B-in
~PSU-B-in
~PSU-B-in
29
+5Vdc-out
+5Vdc-out
+5Vdc-out
30
+5Vdc-out
+5Vdc-out
+5Vdc-out
31
DGND
DGND
DGND
32
DGND
DGND
DGND
Power
Connect operating power to pins 27 and 28 (rows a, b, c are interconnected).
Note: When power is applied to pins 27 and 28, a 5Vdc power output is
available for powering external devices. The 5Vdc is present between pins
29/30 and 31/32 (rows a, b, c are interconnected).
The maximum 5Vdc output current is 200mA.
When no power is applied to pins 27 and 28, pins 29/30 and 31/32 can be used
for powering the device from 5Vdc. The maximum current is 340mA.
Line
Connect the 2-wire leased line to pins A7 and C7. In 4-wire mode, pins A7 and
C7 are the input of the receive pair, pins B4 and B6 connect to the transmit pair.
Data Interface RS232C
The interface pins A11..22 and C11..18 allow for direct connection to a
V.24/V.28 or RS232C interface.
Data Interface RS485
The interface pins B21 and B24 are RS485 Rx inputs used in 4-wire RS485 or
RS422 mode. Pins B22 and B23 are used for 2-wire RS485 or Tx outputs in
4-wire RS485 or RS422 mode. Refer to the use of JP1 on page 2-3.
LLM-336R
Connector pin-out
LLM-336R
Connector use

User Guide – Hardware Details and Installation Leased Line Data Modem LLM-336
Page 2-10
page intentionally left blank

Leased Line Data Modem LLM-336 User Guide – Configuration
Page 3-1
3
Configuration
Introduction
If none of the pre-configured operating modes as presented on page 2-7 suit
your application, the modem can be reconfigured by means of AT commands.
To accept AT commands, the modem must be switched to configuration mode.
Configuration mode
The command/configuration mode is selected by means of putting dip switch
DS1.7 in the ON position and DS1.8 OFF, before power-up or reset.
(see pages 2-3 and 2-4).
AT commands can be issued at common asynchronous data rates from 300
bit/s to 115.200 bit/s in both 10 bit and 11 bit formats.
New configurations can be stored in user profiles 0 and 1 (see page 2-7).
Configurations of the stored profiles can be retrieved by means of the ATZ
command, modified, and then stored in user profiles 0 or 1 by means of the
AT&W and AT&W1 commands.
Configuration Profiles
The modem knows 3 types of configuration profiles:
Active profile: This the default setting of the modem after it is powered-on in
Configuration Mode (see above). All changes to the configuration are made in
the active profile and then stored to one of the stored user profiles.
Stored user profiles: These are profiles 0 and 1 as selected with switch DS1.
Changes made in the active profile can be stored in user profile 0 and 1 by
means of the AT&W and AT&W1 command.
Stored factory profiles: These are profiles 2 to 40 as selected with DS1.
They are stored in the factory and can be used as they are or changed and
stored on profile 0 or 1.
Factory profiles can be custom made on request. Contact MuLogic support for
further information.
AT command conventions
Unless specified otherwise, all command lines must begin with the AT attention
code. This code can be either entered as upper case (AT) or lower case (at)
ASCII characters. (But not as ‘At’ or ‘aT’) The command line is terminated with
the enter key <cr>. The AT code is used to determine the data rate and format
of the command. After a correct command string is received, the modem will
respond with ‘OK’ and the modem’s serial port will be set to the speed and
format in which the command was issued. If a syntax error is made, the modem
will return with ‘ERROR’.

User Guide – Configuration Leased Line Data Modem LLM-336
Page 3-2
Using settings of factory profiles for 11bit async. mode
For example, factory profile 13 (9600 bit/s V.34 asynchronous) is configured for
10 bit data format operation. This can be used for asynchronous data formats
like 9600-8-N-1, 9600-7-E-1 and 9600-7-O-1.
To configure the modem for operation in 11bit mode, like 9600-8-E-1 or
9600-8-O-1, use a terminal emulator program such as e.g. Hyperterm and
configure the serial port to the required data format.
Note: when set to the format 8-E-1 (8 data bits, Even parity), the modem will
only work with devices set to this 8-E-1 format.
When set to the format 8-O-1 (8 data bits, Odd parity), the modem will only work
with devices set to this 8-O-1 format.
Power-on the modem with DS1.7 set to ON and DS1.8 set to OFF.
Enter:
-ATZ13<cr> (This will copy the settings of profile 13 into the
active profile and will set the port of the speed and data format
in which the command was given)
-AT&W<cr> (This will store the settings of the active profile (i.e.
the setting of profile 13 along with the new entered data format)
in user profile 0.
Note: To verify that the terminal is set to the correct speed and format, use the
AT&VFA command. The modem will return the used speed and format.
Power-off the modem and power-on with DS1.1 to DS1.8 set to OFF (this will
select user profile 0)
The escape code
The escape code can be used to switch the modem into command/configuration
mode while the modem is connected with the remote modem.
See chapter 4, Diagnostics.
The escape sequence is issued by sending the “escape character” for three
consecutive times. The escape character is selectable as any ASCII character.
Its value is stored in register S2.
The default value for S2 is 43 (“+”). See chapter 4.
To disable the escape code detection, set S2 to 0 by entering ATS2=0 <cr>.
To prevent the modem from accidentally entering command mode, the escape
sequence is protected by means of a “guard time”: data must be absent for at
least 1 second before and after the escape sequence is issued. In this way
escape characters sent within a string of characters are not recognised as an
escape code.

Leased Line Data Modem LLM-336 User Guide – Configuration
Page 3-3
AT Commands
AT&V Display configuration settings
The AT&V commands are used to give information on the current and
stored settings of the modem.
AT&V Using the AT&V command, the settings of the active profile and the
stored user profiles are displayed.
For displaying the settings of the factory profiles, use the ATZ
commands (ATZ2 .. ATZ40) to copy the settings into the active profile.
Example: ATZ15<cr> AT&V<cr> shows the setting of profile 15.
Note: The setting of the +MS command is only displayed in the active profile
and only when ATF is 0.
AT&V1 This command is used in on-line command mode for displaying the
status of the connection. See chapter 4, Diagnostics.
AT&VFn Displays the speed and format stored in profiles 0 to 40 (n = 0..40)
AT&VFA Displays the actual speed and data format of the terminal.
AT&F Restore initial settings
The AT&F command resets the configuration to the default power-on
settings. (V.34 operation with error correction and data compression).
ATZ Retrieve settings from stored profiles
The ATZ command is used to retrieve the settings from a stored
profile. It is used for simple changes to the factory pre-set stored
profiles.
ATZn Copy configuration of stored profile n (n = 0..40) into the active profile.
For example:
ATZ Copy configuration of stored profile 0 into the active profile.
ATZ1 Copy configuration of stored profile 1 into the active profile.
ATZ2 Copy configuration of stored profile 2 into the active profile, etc.
AT&W Write configuration in stored profiles 0 or 1
The AT&W command writes the current configuration in profiles 0 or 1.
AT&W0 Write configuration into stored profile 0
AT&W1 Write configuration into stored profile 1
Note: The profile used on power-up is determined by switches DS1.1 to DS1.6
ATSn Read/Write S-registers
ATSn=x Writes value x in S-register n.
ATSn? Reads and displays the value of S-register n.

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Page 3-4
The modem modulation modes of the LLM-336 are set by means of the AT+MS
command for full duplex modes, and the ATF command for half duplex modes.
ATF Half duplex modulation modes
ATF0 (Automatically set when AT+MS settings are used)
ATF2 V.23 1200 bit/s (Asynchronous buffered mode (&Q6) only)
ATF3 V.27 2400 bit/s
ATF4 V.27 4800 bit/s
ATF5 V.29 4800 bit/s
ATF6 V.29 7200 bit/s
ATF7 V.29 9600 bit/s
ATF8 V.33 12000 bit/s
ATF9 V.33 14400 bit/s
AT+MS Full duplex modulation modes
The syntax for entering the AT+MS command is as follows:
AT+MS=<mod>,[<automode>,<min_rate>,<max_rate>]<cr>
Where "mod", "automode", "min_rate"and max_rate" are numerical
parameters.
Note: the <mod> parameter is mandatory. The parameters between the
brackets are optional.
mod: Modulation mode
automode: Select automode (always leave at 0)
min_rate: Lowest allowable data rate
max_rate: Highest allowable data rate.
<mod>
Modulation
Speed range (min_rate, max_rate)
0
V.21
300 bit/s (Asynchronous buffered mode (&Q6) only)
1
V.22
1200 bit/s
2
V.22bis
2400, 1200 bit/s
9
V.32
9600, 4800 bit/s
10
V.32bis
14400, 12000, 9600, 7200, 4800 bit/s
11 V.34
33600, 31200, 28800, 26400, 24000, 21600, 19200,
16800, 14400, 12000, 9600, 7200, 4800, 2400 bit/s
64
Bell 103
300 bit/s (Asynchronous buffered mode (&Q6) only)
69
Bell 212A
1200 bit/s
<automode>
(not used for leased line operation, leave at 0)
Note: Using the AT&V command, the setting of the +MS command is only
displayed in the active profile and only when ATF is 0.
The command AT+MS? can be used for displaying the current +MS setting.
Examples
V.22 mode: AT+MS=1,0<cr>
V.34 all rates enabled: AT+MS=11,0
V.34 9600..24000 bit/s: AT+MS=11,0,9600,24000<cr>
V.34 19200 only: AT+MS=11,0,19200,19200<cr>
Example: Setting V.32bis synchronous with data rate of 7200 bit/s:
- ATZ18<cr> retrieve configuration of stored profile 18 (V.32bis, 9600bit/s)
- AT+MS=10,0,7200,7200<cr> Set V.32bis, 7200 bit/s.
- AT&W<cr> Store in profile 0
Power-on or reset with DS1.1 to DS1.8 all set to OFF (user profile 0)
Modulation modes