Crestron
MC2E
2-Series Professional Media Controller
NOTE:
To support RS-485, tie pin 1 (RXD-) to pin 9 (TXD-) and pin 4 (TXD+) to
pin 6 (RXD+) in the cable. Refer to the table after this note, titled "COM Pinout to
RS-485 Bus".
Non-Standard COM Pinouts
PIN DIRECTION
DESCRIPTION
1*
To MC2E
(RXD-) RS-422 Receive Data (Idles Low)
2
To MC2E
(RXD) RS-232 Received Data
3
From MC2E
(TXD) RS-232 Transmitted Data
4
From MC2E
(TXD+) RS-422 Transmit Data (Idles High)
5
Common
RS-232 and RS-422 Signal Common
6
To MC2E
(RXD+) RS-422 Receive Data (Idles High)
7
From MC2E
(RTS) RS-232 Request To Send
8
To MC2E
(CTS) RS-232 Clear To Send
9
From MC2E
(TXD-) RS-422 Transmit Data (Idles Low)
Where *= RS-422 transmit and receive are balanced signals requiring two lines plus a ground in
each direction. RXD+ and TXD+ should idle High (going Low at the start of data transmission).
RXD- and TXD- should idle Low (Going High at the start of data transmission). If necessary,
RXD+/RXD- and TXD+/TXD- may be swapped to maintain correct signal values.
COM Pinout to RS-485 Bus
COM (DB9)
CONNECTOR
RS-485 BUS
Tie Pins 1 & 9
-
Tie Pins 4 & 6
+
Pin 5
G
For more information, refer to “Slot 6: C2I-MC2-COM2” on page 30.
COMPUTER
COMPUTER
This DB9F connector is used when programming the unit with a PC. The port is
modem compatible. The modem and/or PC program cable are not included. Supports
baud rate of up to 115 Kb. Use with a standard DB9 straight through cable.
Standard DB9 Pin Assignments
PIN #
ABBREVIATION
DESCRIPTION
1
DCD
Data Carrier Detect
2
RD
Receive Data
3 TD
Transmit
Data
4
DTR
Data Terminal Ready
5 SG
Signal
Ground
6
DSR
Data Set Ready
7
RTS
Request To Send
8
CTS
Clear To Send
9 Ring
Ring
Indicator
5 4 3 2 1
9 8 7 6
Female DB9 Connector
6 7 8 9
1 2 3 4 5
Male DB9 Connector
NOTE:
DTR, pin 4 and DSR, pin 6 are not normally used.
Operations Guide – DOC. 6142
2-Series Professional Media Controller: MC2E
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