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Note
Any TIM with an RS-232 port can be used, in other words, the TIM 3V-IE variants, the
TIM 4R-IE and all TIM 4 types.
Note
Do not forget to activate the terminating resistor for the RS-485 bus on the last connector
using the slider switch.
RS-485 operation of the MD3
If several MD3s are connected in parallel over the RS-485 port, remember the following
when making the settings for the modem and setting the parameters for the TIM:
1. The MD3 modem must be set to profile 15 using the 10-pin DIL switch.
2. Make sure that this user-configurable profile 15 is set so that it is suitable for RS-485
3. The RS-485 interface must also be activated at the 4-pin DIL switch accessible from
4. The RS-485 interface of the TIM connected to the MD3 modem must also be activated at
5. Since data traffic can only handled in half duplex over RS-485, the mode of the
6. Once the MD3 has received data and forwarded it to the TIM, the MD3 requires a pause
Table 6-38
Speed on the dedicated
line
SINAUT ST7 Station control system - System Manual
System Manual, 05/2007, C79000-G8976-C178-06
mode using a PC and terminal program.
below.
the 8-pin DIL switch accessible from above (applies to all TIM 4 types).
connected TIM must be set to half duplex.
of several ms before it is ready to send data. The TIM must take this pause into account
by setting an RTS/CTS delay; in other words, after receiving data it must only start
transmitting data after the RTS/CTS delay has expired. The duration of the delay
depends on the transmission speed being used on the dedicated line (see table below).
RTS/CTS delay for MD3 in RS-485 mode
RTS/CTS delay
300 bps
1200 bps
2400 bps
9600 bps
Installing and putting a SINAUT modem into operation
Speed on the dedicated
line
100 ms
14400 bps
100 ms
19200 bps
50 ms
26400 bps
25 ms
33600 bps
6.6 Analog dial-up modem MD3
RTS/CTS delay
10 ms
10 ms
10 ms
10 ms
291
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