User Manual

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