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Table 5. COM2 Pin Descriptions—RS/EIA-232 (Cont'd)
Pin
Input/
Number
Output
5
--
6
OUT
7
IN
8
OUT
9
--
Pin Descriptions—RS/EIA-422/485 Mode
Table 6
lists the
operate in RS/EIA-422/485 mode. See
Table 6. COM2 Connector Pin Descriptions—RS/EIA-485 Mode
Pin
Input/
Number
Output
1
—
2
OUT
3
IN
4
--
5
--
6
--
7
IN
8
OUT
9
--
NOTES:
• RXD+ / RXA and RXD– / RXB are data sent into the radio to be transmitted out
• RXD+ / RXA is positive with respect to RXD– / RXB when the line input is a "0"
• TXD+ / TXA and TXD– / TXB are data received by the radio and sent to the connected
device
• TXD+ / TXA is positive with respect to the TXD– / TXB when the line output is a "0"
14
Pin Description
Signal Ground—
Connects to ground (negative supply potential) on chassis.
Alarm Output (DSR)—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. This pin may be used
as an alarm output. (See Reference Manual.)
RTS (Request-to-Send)
CTS (Clear-to-Send)—Goes "high" after the programmed
CTS delay time has elapsed (DCE), or keys an attached ra-
dio when RF data arrives (CTS KEY).
Not Used—Do not connect
connector pin functions for radios configured to
COM
Pin Description
Not Used—Do not connect
TXD+/TXA—Non-inverting driver output. Supplies data to
the connected device.
RXD+/RXA—Non-inverting receiver input. Accepts data
from the connected device.
Not Used—Do not connect
Signal Ground—Connects to ground (negative supply po-
tential) on the radio's PC board and chassis.
Not Used—Do not connect
RXD– /RXB—Inverting receiving input
TXD– /TXB—Inverting driver output.
Open (User configurable via internal jumper. See Reference
Manual for details.)
MDS SD4 Startup Guide
Figure 11
for wiring schemes.
05-4669A01, Rev. A
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