Rev. 1.43
User's
Guide
77
4.11.2. RS-422/RS-485/V.35
option
These VSBC-6862 ports are compatible with these three modes.
The following signals are controlled by the PowerQUICC II:
TxD, RxD, TxC, RxC
in differential mode
CTS, RTS and DCD
in RS-232 mode for V.35
As described above, the VSBC-6862 did not provides all defined signals for
V.35, it provides all 'transmission signals' but not for example, the loopback or
ring indicator signals.
All ports support full and half-duplex mode, and two ports supports also support full synchronous
operations.
The internal I/O ports dedicated to RTS is connected to the internal data transmit enable signal.
This permits to determine the function for half or full-duplex modes as:
Full-duplex:
configure RTS always active
Half-duplex:
configure RTS as normal RTS
The PowerQUICC II has also the possibility to disable his receiver while emitting (see bit DRT in
register PSMR).
Each port has its own resistor network.
These resistors are on sockets. ACTIS choose to implement manual resistor networks to keep the RS-
485 network always working, independently of the power state of the VSBC-6862.
These resistor networks are to be installed only when the corresponding serial port is at one of both
ends of the RS-485 network cable.
In DCE mode (to connect a modem), the recommended cable pinout is:
Pin function
Sub-D 15, 3 rows, male
Sub-D 25, 2 rows, male
Shield 1 1
Transmit Data+
2
2
Receive Data+
14
3
Request To Send
6
4
Clear To Send
8
5
Data Set Ready
15
6
Ground 7
7
Data Carrier Detect
10
8
Receive Clock-
11
9
Transmit Clock-
5
12
Transmit Data-
3
14
Transmit Clock+
4
15
Receive Data-
13
16
Receive Clock+
12
17
Data Terminal Ready
9
20
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Содержание VSBC-6862
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