The bitbus-modem is the tie between the Bitbus-network and a computer with a standard V.24 gateway.
With its help it is possible to set up relays and output modules with the dpt-tool and save them in the
bitbus joints . The master or the FCP with the bitbus joint “1” must be for programming disconnected
from the network !!! (the bitbus-modem can only be used with the address “1”)
Is the programming with the detectomat programming tool finished, than you can start the transmission
with the corresponding button. This will load the data directly into the bitbus-cpu of the participant.
The transmission can be done straight from the dpt tool with connection of the bitbus-modem.
For closer instructions please refer to the dpt manual.
The data can be written into the bitbus-module as well as being read out. First of all you have to select
the at the module set (via DIP-switch) bitbus-tie-address. Then the data transfer can be started. The
progress is displayed with the progress status bar and percentage:
Attention !!! The bitbus-modem operates in default with high transfer rate (375 KB). It is to be insured
that the to be programmed bitbus-module is as well on high speed setting.
Basically all participants have to be set to the same transfer rate.
The setup of the transfer rate is further described in chapter 3.
2. Technique of the Bitbus-Modem
The bitbus-modem is supplied with a power supply unit 7-9 VDC.
Intern the voltage is stabilized to 5 V. Optional the modem can also
be operated with a 6 V accumulator.
The RS 232 gateway gets connected to the computer vie the enclosed 9-pole standard d-sub cable
(lap link). The RS 232 gateway is equivalent to a RS 232/V.24.
The bitbus gateway is done by two 9pin D-Sub connections (Plug & Jack), the plug assignment corre-
sponds to the bitbus norm IEEE 1118.
The assignment of the wiring is documented in chapter 4.
This cable is as well enclosed .
2.1 Transmitting Bitbus
The transmission from the modem is indicated by LED’s
System LED`s Bitbus:
T1 Indication modem ready. The green LED glows permanent. If T1 does not glow than there is a
fault in the modem-gateway.
T2 During start up the red LED glows shortly. This LED also glows when files are transmitted into
the modem, but have not yet been picked up from the bitbus participant.
BA The green LED signals a file transfer from the bitbus-gateway.
2.2 Transmitting RS 232
Status LED`s RS 232
TxD The yellow LED glows if files are transmitted by TxD.
RxD The green LED glows if files are being received by RxD.
3. Position and setup of the Jumper
After loosening the screws of the front plate , it is possible to open the lid.
Jumper and DIP-switches can be setup as follows
J1, J2: Watchdog
J4, J5: Activation of the bitbus-end resistor
Hexa-code-switch: Setup bitbus-tie address
Switch Hex1 up: 0; Switch Hex2 down: 1
These setup is address „1“
and may not be changed
Jumper-field JP3: Setup of the memory mounting
(may not be changed)
Hexa-code-switch: Setting bitbus tie address
Function Switch Hex1 Switch Hex2
Tie-address „1“ 0 1
SIL-Switch: Setting of the gateway parameter:
High: Switch up
Low: Switch down
Function SW 1 SW 2
375 kBit/s High Low
62,5 kBit/s HighHigh
SW 3 – 6 do NOT change !!!
SW 3 SW 4
SW 5 SW 6
The setup of the parameter for the V.24 gateway is setup as follows:
9600 Baud 8 bits no parity 1 stop bit
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