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Pin Descriptions—
RS/EIA-422/485
Mode
16
Table 7. COM2 Pin Descriptions—RS/EIA-232 Mode
Pin
Input/
Number
Output
1
OUT
2
OUT
3
IN
4
IN
5
--
6
OUT
7
IN
8
OUT
9
--
Table 8 lists the
COM2
in RS/EIA-422/485 mode. See Figure 15 for wiring schemes.
Table 8. COM2 Connector Pin Descriptions—RS/EIA-422/485
Pin
Input/
Number
Output
1
OUT
2
OUT
3
IN
Accepts payload data from the connected device.
4
IN
5
--
6
OUT
7
IN
8
OUT
9
--
SD Series Reference Manual (x710 Mode)
Pin Description
DCD (Data Carrier Detect/Link)—A high (asserted)
indicates signal received.
RXD (Received Data)—Supplies received data to the
connected device.
TXD (Transmitted Data)—Accepts TX data from the
connected device.
Sleep Mode Input—Grounding this pin places the radio in a
low power consumption mode.
Signal Ground—Connects to ground (negative supply
potential) on chassis.
Alarm Output (DSR)—Behavior is user-configurable. Default
behavior: An RS-232 high/space (+5.0 Vdc) on this pin
indicates an alarm condition. An RS-232 low/mark (–5.0 Vdc)
indicates normal operation.
RTS (Request-to-Send)—Keys the transmitter.
CTS (Clear-to-Send)—Goes "high" after the programmed
CTS delay time has elapsed (DCE), or keys another
connected radio when RF data arrives (CTS KEY).
Reserved—User I/O for special applications.
port pin functions for radios configured to operate
Mode
Pin Description
Carrier Detect/Link—A high indicates signal received.
TXD-/TXA (Transmitted Data -)—Inverting driver output.
Supplies received payload data to the connected device.
RXD-/RXA (Received Data -)—Inverting receiver input.
Sleep Mode Input—Grounding this pin places the radio in a
low power consumption mode.
Ground—Connects to ground (negative supply potential) on
the radio's PC board.
Alarm Output—Behavior is user-configurable. Default
behavior: A high on this pin indicates an alarm condition; a low
indicates normal operation.
RXD+/RXB (Received Data +)— Non-inverting receiver input
TXD+/TXB (Transmitted Data +)—Non-inverting driver output.
Reserved—User I/O for special applications
MDS 05-4670A01, Rev. E
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