Alcorn Mcbride V+ series, User Manual

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12-4 IO64 Hardware Reference
Remote Port: RS-232, RS-485, MIDI
The Remote Port is factory configured as an RS-232C serial port, but can be
reconfigured as an RS-485 or MIDI port. When reconfigured as a MIDI port,
MIDI Input and Output is received on and sent out the MIDI connector.
Pin RS-232 Connection RS-485 Connection
1 N/C N/C
2 RS-232 RXD N/C
3 RS-232 TXD N/C
4 N/C N/C
5 GND GND
6 N/C RS-485 TX+
7 N/C RS-485 TX-
8 N/C RS-485 RX+
9 N/C RS-485 RX-
Table 3 – Remote Port connections for RS-232 and RS-485 operation

Configuring the Remote Port as RS-485
1.
Set jumper W1 to the “RS-485” position.
2. Set Jumper W3 to the RS-232 position. (This selects normal rather than
MIDI baud rates.)
3. It is often desirable to terminate RS-422 and RS-485 signals at the receiving
end. To terminate the line at the IO64 end, connect a 220 Ohm resistor
between pin 8 and pin 9 of Remote Port cable’s connector inside the
housing. To terminate the receiver at the remote end, connect a 220 Ohm
resistor across the RXD pins of the remote equipment.

Configuring the Remote Port as MIDI
1.
Set jumper W1 to the “MIDI” position.
2. Set Jumper W3 to the MIDI position.

Configuring the Remote Port as RS-232
1. Set jumper W1 to the “RS-232” position
2. Set Jumper W3 to the RS-232 position.