Telecast Adder 162, Руководство пользователя, Страница: 10 / 41

10
Digital Connections
The Model 162/322 assembly accepts and multiplexes four RS-232C or RS-422 digital data
signals and two remote relay closures. The 162/322 is also used to receive a transmission,
restore the digital signals and provide switch closures. The number of data channels is fixed and
independent of the number of audio channels in the assembly. Both data input and output are
accomplished on the same connector.
Digital signal connections are made via 9-pin D connectors; see Figure 5. The connection
specifications are listed in Table 3. A 110 Ohm terminating resistor placed across the balanced
inputs may be needed if input cable lengths are in excess of 6 feet. Serial communications can
be RS-232 at one end and RS-422 at the other, if desired.
Contact closure input is activated by pin 8 on contact to ground or to a TTL logic 0 signal level.
Contact closure output is established by an isolated, normally open, dry contact built onto the
Main PC Board.
5 1
6 9
1 2 3 4
DATA I/O
Figure 5: 9-pin D-connectors
Table 3: Digital Cable Connections
PIN Connectors 1 & 2 Connectors 3 & 4
1 RS-422 in (-) RS-422 in (-)
2 Contact out No Connection
3 Ground Ground
4 RS-232 out RS-232 out
5 RS-422 out (-) RS-422 out (-)
6 RS232/422 in (+) RS232/422 in (+)
7 Contact out No Connection
8 Contact in No Connection
9 RS-422 out (+) RS-422 out (+)
The four digital I/O connectors are AMP 747905-2, D subminiature female or equivalent.