REXROTH VT-VRPD-2 Start-Up And Operation page 55

RE 30126-01-B/08.07 | Manual
NULL modem cable
Remote Modem connection:
The external remote modem must be able to answer incoming calls.The connection
between the remote m odem and the VT-VRPD card must be a NULL modem cable.
The remote modem must be configured to auto answer an incoming call (Hayes
Command ATS0=1 => sets auto answer to 1 ring). The remote modem DTR (Date
Terminal Ready) should be set to override (Hayes Command AT&D0), because
otherwise the modem will not answer since the VT-VRPD does not control the DTR
line.
Signal Name
TD (Transmit Data)
RD (Receive Data)
SG (Signal Ground)
It is recommended that a Winview recording is used when monitoring
actual signals. The communication speed due to the modem connection
is not fast enough to get the required resolution.
Establishing the connection using this method will take some. After the
connection is established BODAC can be used as if there were a direct
serial connection to the card although the communication rate is
significantly lower.
Hydraulics | Bosch Rexroth AG
BODAC – Menu Description 5
DB-9 Pin DB-9 pIN
3 - 2
2 - 3
5 - 5
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Signal Name
RD
TD
SG