TELEGYR 805/ 809 : Telegram structure


Telegram format with variable length

The telegram with variable length is used for the data transmission of the user data between the controlling station and the controlled station and in the reversed direction.


Control direction




Monitoring direction




Telegram format with fixed length

The telegram with fixed length is normally used for link layer services. In special cases this format with fixed length can also be used as an acknowledgement instead of a single character.



Single character

The single character is normally used in order to confirm data link services and user data.

E5H = ACK : Positive acknowledge


Communication number :

The number of the slave for the data transfer on one line is called COM number ( communication number ). When the slave receives a telegram with this number it is sent from the master to it. The slave number in the telegram received from the master, defines the return address. A "Command to all" is sent from the master with COM No = 255 and will be analyzed but not confirmed from all slaves.


Control code in control direction :




  0      0     0      0

Reset frame count bit ( frame count bit is set to zero )

  0      0     0      1

Status interrogation

  0      1     1      0

Command ( write with frame count bit  = 0 )

  0      1     1      1

Command ( write with frame count bit = 1 )

  1      0     1      0

Interrogation ( read data events with frame count bit = 0 )

  1      0     1      1

Interrogation ( read data events with frame count bit = 1 )


Operation request in monitoring direction :





No further data available.


Further data available, that means not all information to be transmitted could be entered into the transmission block.


Information type character :





Information type is defined in the IAC extension. ( long format )


Information without time tag


Information with time tag


Measurand value


Extension of the information type character :


IACe ( 4... 255 ) Direction


4 mon

Measured value with time tag

5 mon

Measured value fast scan

6 mon

Protection indication with time tag

7 mon

Analogous measured value ( average )

8 con, mon

indication ZFM ( TELEGYR 709 )

9 mon

Digital measured value ( average )

10 mon

Counter single current

11 mon

Counter double current

12 mon

Counter after control recall



15 con, mon

General interrogation "indication block", indication block

16 con, mon

General interrogation "analogous measured value", analogous measured value

17 con, mon

General interrogation "digital measured value", digital measured values

18 mon

System information block



25 mon

Own station number



35 mon

Time request from central station



64 internal

internal counter acknowledge



128 con

Pulse command

129 con

Persistent command

130 con

Stop persistent command

131 con

Set point command

132 con

Regel impulse command

133 con

Set point PBN

134 con

PBN command

135 con

Time synchronization



139 con

Request measured value

140 con

Request counters F

141 con

Request counters FR

142 con

Request counters FT

143 con

Request counters FRT

144 con

Request counters T

145 con

General Interrogation "counters"

146 con

Single request counter



148 con

Set counter



150 con

Request measured values "Fast scan"

151 con

General Interrogation mask "indications"

152 con

Analogous measured value mask "Fast scan"

153 con

Analogous measured value mask "Slow scan"

154 con

General Interrogation mask "analogous measured values"

155 con

Analogous measured value mask "limit"

156 con

General Interrogation mask "digital measurands"

157 con

Digital measured value mask "limit"

158 mon

Request to central station : General Interrogation "indications"

159 mon

Request to central station : General Interrogation "measured value"

160 con

General Interrogation "indications"

161 con

General Interrogation "measured values"

162 con

General Interrogation "system information"

163 con

Acknowledge "system information"



165 con

Request "station number"

166 con, mon

Request "disturbance value transmission", disturbance value transmission



168 con, mon

Restart subsystem

169 con, mon

Switch over subsystem

170 mon

Error text transmission



175 con, mon

Parameter transmission

176 con, mon

CONCAP transmission



250 con, mon

Transparent information

251 con, mon

Rundsteuer information




Address :

Two types of addressing are available for the addressing. The hardware address and the software address. The software address is only used in monitoring direction, the hardware address in both directions. The reduction of the address is displayed with the address extension bit ( E ) and the station number bit ( S ).

The station number can be missing if several information blocks with the same station number are one behind the other. In this case only the first information must contain the station number or when the transmission station the origin station is, that means the substation is communicating directly with the master station.

The address extension bit displays whether the address of an information contains the cupboard number. If the cupboard number is 0 it can be missing. The reduction of the address id valid for monitor direction and for control direction in the same way. But it is not allowed for commands.








Station number

0... 1020

SW bit

The SW bit indicates if the following bit contains a hardware- or a software address.
0 = Hardware address
1 = Software address

Cupboard number

0... 3

Chassis number

0... 4

Slot number

0... 15

Point number

0... 31       for hardware address
0... 32767  for software address



MAYR Software

Wuerzburger Ring 39,  D 91056 Erlangen

Manual LIAN 98

LIAN 98 Protocol Router, Simulator and Analyzer
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