Data Connect IG202T-R38 User Manual
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PTT When TX OnAT &P TTx Turns on /off “PTT When TX On” option. For x = 0 modem PTTrelay doesn’t react on carrier On/Off changes. For x = 1 PTT relay isswitched On when carrier is On, and switched Off when carrier if Off.This relay may be used to turn On external transmission equipment (forexample radio trasmitters). Use SQ InputAT &S Qx Turns on /off “Use SQ Input” option. For x = 0 modem DCD (CD onRS-232C and front panel LE diode) follows in-channel carrier presencechanges. For x = 1 modem DCD (CD on RS-232C and front panel LEdiode) follows SQ input state changes. SQ input may be used forindication of in-channel carrier presence signalization when externalreception equipment is used (ex. radio receivers). Use DTRAT &D T Rx Turns on /off “Use DTR” option. For x = 0 state of DTR input isoverriden and assumed that is always set to 1. For x = 1 DSR signal iscopied to DTR signal. Modem works properly only when DTR = 1. Carrier controlAT &C C x Selects transmission carrier control mode. For x=0 transmission isalways on and carrier is permanent. For x = 1 transmission is activeonly if RTS = 1 (Data Terminal Equipment requires to send). For x = 2transmission is active only if there is data in transmission buffer. Thismode is called DOX - Data Operated Xmission.Important: If half-duplex mode is configured, it is obligatory to set “Transmissionon RTS” or DOX option. Otherwise, modem would permanentlytransmit on a half-duplex line, disabling line access to other modemsconnected to it. Character FormatAT &C Fdp s Selects the number of data bits, parity and stop bits. Valid range fordata bits is 5 to 8; for parity is N(one), E(ven), O(dd); for stop bits is 1or 2. For FSK modulations due to restrictions associated with logicregeneration in asynchronous mode, the modem uses resynchronisationprocedure at reception. In this mode the character format is between 5and 9 useful bits, enclosed with 1 start and 1 stop bit. The parity bit,and additional stop bit is considered as a data bit and will betransmitted without processing, therefore for example, transmissionand reception of 9N1 format is possible with FSK modulations with8E1 or 8O1 settings.Example: AT&CF8N1 command line sets format: 1 start / 8 data / 1 stop bit.Modem responds with “OK” message.IG202T-R38 User Manual v1.3, Rev. date: 16 November, 2009 12 |
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