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REMOTE TESTS

 – This feature makes possible to perform testing of remote modems, in FSK 

mode, on point-to point and multipoint links with selective addressing of the remote modem. 
Every modem, when is in data mode, search received data for remote loop-back command 
pattern with its own (local) address. When local or own address is recognized, modem proceeds 
to internal loop-back mode with RS-232 signal isolated from DTE. Addressed modem remains 
it that state until carrier is lost. Other modems on the same network stay in stand-by mode 
during the tests. All remote modems, in internal loop-back or stand by mode, indicate remote 
test by slow PWR led blink (1sec / 1sec cycle). 

 
 
Remote test command pattern on 

IG202T-R38

 modem is compatible with I

G202T-R38

 modem 

and with IG202T-R38

 modems from Cegelec and consists of seven characters as follows: 

 

0AAh  0AAh  05Ah  05Ah  <remote address>  0A5h  0A5h 

 

There may be maximum 32 different addresses (0 to 31) on one and the same network.  

There are two addresses in every modem, and they may be adjusted with two AT commands. 

 

AT&LAxx

 Local 

Address

 – specify modem own address. Used as modem address when 

in data mode. Must be saved with AT&W command in non-volatile memory to 
be valid after power up. 

 

AT&RAxx

 Remote 

Address

 – specify address of remote modem, which will be addressed 

with remote commands in command mode. After entering the command mode 
remote address is initialized from non-volatile memory. 

 
There are 4 remote test commands. All of them first issue remote loop-back command to 
remote modem addressed with specified remote address.  If remote loop may not be establish, 
error test status is returned. When remote loop are established and test is in progress, return to 
command mode may be accomplished by sending any character from terminal or PC to modem. 
Also, tests 6, 7 and 8 automatically abort and return modem in command mode in case of 
carrier detect failure. After returning to command mode, modem returns values of received 
level in dB units, and duration of test in seconds. Also, test 9 returns bit count and bit error 
during the test.  

 
 

AT&TST6

 

Remote Sequence F

- - remote test where local modem generates the F- 

frequency of the programmed channel, detected and returned by the remote 
modem. Valid only in FSK mode. 

 

AT&TST7

 

Remote Sequence F+

 - remote test where local modem generates the F+ 

frequency of the programmed channel, detected and returned by the remote 
modem. Valid only in FSK mode. 

 

AT&TST8

 

Remote Sequence F

+

/F-

 - remote test where local modem generates the F+/F- 

frequency sequence of the programmed channel, detected and returned by the 
remote modem. Valid only in FSK mode. 

 

AT&TST9

 

Remote Sequence 511 bits

 - remote test where local modem generates the PN 

Sequence at programmed channel, detected and returned by the remote modem. 
This test counts number of bits sent, and error bits during the test, which 
indicate the bit error rate of the transmission line. Valid only in FSK mode. 

 
 
 

 

IG202T-R38 User Manual v1.3

, Rev. date: 16 November, 2009  

15

 

Summary of Contents for IG202T-R38

Page 1: ...DATA CONNECT ENTERPRISE IG202T R38 INDUSTRIAL GRADE MODEM User Manual v1 3 http www dataconnectus com...

Page 2: ...point to point or point to multipoint mode with receive and transmit channels independently set For V 29 mode four wire full half duplex is default The modem employs advanced Texas Instruments 32 bit...

Page 3: ...mode see Entering Command Mode section which allows modem configuration PWR In data mode PWR LED is ON when modem is power supplied and in proper function PWR LED is OFF in case of power supply is not...

Page 4: ...o Send 7 SW RUN Switch Run selection input x 8 SW COM Switch selection output x 2 2 1 RS 232C Data serial interface This connector is a SUB D 9 pin female type connector with screw locking It provides...

Page 5: ...ware version Figure below depicts analog line interface Figure 4 Analog line interface 2 2 4 Power Power Supply Power supply connector is a 2 position screw plug type for 2 2 5 2 mm wire used for conn...

Page 6: ...2 4 wire FSK and V 29 mode Z input 600 Z output 600 JP401 JP402 2 3 JP405 1 2 4 wire FSK MUX1 mode Z input 10k Z output 600 JP401 JP402 JP406 2 3 JP402 1 2 Z input 600 Z output 10k JP401 JP405 JP406 2...

Page 7: ...DEF2 to connector JP412 ON JP411 OFF Fail relay signal presence on connector JP411 JP412 Do not proceed fail relay signals DEF1 and DEF2 to connector JP412 OFF JP408 ON Proceed the alternate squelch...

Page 8: ...ge Entered command is accepted only if previous AT command is executed and acknowledged with corresponding message Advice Since modem doesn t support character echoing in command mode it is advised to...

Page 9: ...r data transmission AT TC60x Sets Cegelec 600Bd 60x channels for data transmission Valid range for x is 1 3 corresponding to channels 601 to 603 AT TC40x y Sets CCITT R 38A 200 300Bd channels for data...

Page 10: ...ption Modem responds with OK message Reverse FSK frequencies AT RFx Sets frequencies order in FSK modes When set to 0 then normal FSK frequencies order are set and F corresponds to data line SPACE con...

Page 11: ...no buffering x 3 Indactic Slave bit synchronous data no buffering x 4 Indactic Master asynchronous data buffering x 5 Indactic Slave asynchronous data buffering x 6 ITU R M 493 11 asynchonous data bu...

Page 12: ...smission is active only if RTS 1 Data Terminal Equipment requires to send For x 2 transmission is active only if there is data in transmission buffer This mode is called DOX Data Operated Xmission Imp...

Page 13: ...x mode is disabled and reception is always enabled For x 1 reception is active only if trasmission is inactive and carrier is off This mode is used on two wire 2W line configuration to suppress receiv...

Page 14: ...rements are of narrow band in channel type During tests PWR led blinks fast 100ms 100ms cycle DSR and CTS signals at RS 232 interface are active DCD led and DCD RS 232 signal indicate receive signal s...

Page 15: ...s initialized from non volatile memory There are 4 remote test commands All of them first issue remote loop back command to remote modem addressed with specified remote address If remote loop may not...

Page 16: ...is state is indicated by slow PWR led blink 1sec 1sec cycle Modem performs the same task as it have received remote loopback pattern Modem turns carrier on at transmit port and expect carrier at recei...

Page 17: ...have at least one RS232C serial port available Bootloader procedure may be started without modem power turn off Follow steps below 1 If you already have installed C2000Prog on your PC skip steps 2 and...

Page 18: ...k at Program command button File selection dialog appeared Select and open new firmware file File format is Intel hex with hex extension File name must be with IG202T R38xx format where xx is firmware...

Page 19: ...ck frame 1U 84TE Front view Figure A1b Rack frame 1U 84TE Rear view Figure A1c Rack frame 1U 84TE Side view 172 5 175 Figure A1d Rack 1U 28TE Front plate view D C E I G T 2 0 2 T R 3 8 Figure A1e Rack...

Page 20: ...I G 2 0 2 T R 3 8U s e r Ma n u a l v 1 3 R e v d a t e1 6N o v e mb e r 2 0 0 9 I G 2 0 2 T R 3 8 R a c k 3 U u p t o 1 4 mo d e ms D C E...

Page 21: ...D a t a C o n n e c t w w w d a t a c o n n e c t u s c o m D a t aC o n n e c t...

Page 22: ...CE pinout on the other side of cable DIAG port equiped with this cable is used for setting IG202T R38 modem parameters with AT commands when switch is in RUN cable is for upgrading firmware using boot...

Page 23: ...7 2610 2700 2790 CH308 2970 3060 3150 CH201 420 480 540 CH202 660 720 780 CH203 900 960 1020 CH204 1140 1200 1260 CH205 1380 1440 1500 CH206 1620 1680 1740 CH207 1860 1920 1980 CH208 2100 2160 2220 CH...

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