PR 5610 Installation Manual Hardware Configuration
Sartorius 33
Connection of a Modem to the RS 232 interface (asynchronous protocol)
Modem
course of events:
Transmitter side:
5610 induced: switch on DTR
5610 induced: switch on RTS
Modem confirmed: switch on CTS
5610 induced: send TxD
Receiver side:
Modem confirmed: DCD is ok
5610 exspects: receive RxD
PR 5610 with PR 1713/04
In case of hardware handshake:
Connect lines with the opposite side (see above).
The modem is controlled by the signals of the interface PR 1713/04 (see above).
In case of software handshake:
XON/XOFF control has to be enabled, the Lines RxD, TxD and GND are connected 1 : 1. Provide links on both sides
between RTS-CTS and DCD-DTR-DSR or link RTS-CTS-DSR. With this operation mode the modem answers
automatically with a 'OK' after a command 'at'. Now you can start to set the parameters with a terminal.
a)
auto answer = on
This parameter is stored in register 's0' of the modem. The command is ats0=1.
b)
DCD = on
Data carrier detect is always on. Command is at&c0.
c)
hang up on DTR off
Modem assumes command state when DTR goes on to off. The command is at&d1. Other modems than Elsa
Microlink 33.6TQV may require at&d2 (hang up if DTR goes to off). If this parameter is wrong, the auto answer
function is not working or the modem will not hang up.
In case of problems consult the manual of the modem to find out the right commands!
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