GE MDS SD Series Technical Manual page 32
Secure, long range ip/ethernet & serial
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Also See for MDS SD Series:
- Reference manual (148 pages) ,
- Technical manual (124 pages) ,
- Quick start manual (4 pages)
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Table 8. COM2 Pin Descriptions—Radio in RS-232
Pin
Radio
Number
Input/
Pin Description
Output
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 9. COM2 Pin Descriptions—Radio in RS-422/485 Mode
Pin
Radio
Number
Input/
Pin Description
Output
1
OUT
Carrier Detect/Link—A low indicates signal received.
2
OUT
TXD+/TXA (Received Data +)—Non-inverting driver output.
Supplies received payload data to the connected device.
3
IN
RXD+/RXA (Transmitted Data +)— (Transmitted Data +).
Non-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 Output—Behavior is user-configurable. Default
behavior: A high on this pin indicates an alarm condition; a low
indicates normal operation.
7
IN
RXD-/RXB (Transmitted Data -)— Inverting receiver input
8
OUT
TXD-/TXB (Received Data -)—Inverting driver output.
9
--
Reserved—User I/O for special applications
COM2 PORT NOTES & WIRING ARRANGEMENTS:
• 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 out
• TXD+ / TXA is positive with respect to the TXD– / TXB when the line output is a "0"
EIA-422 4-WIRE CONNECTIONS
TXD +
RXD +
2
3
RXD +
RXD –
RXD –
7
TXD +
8
TXD –
TXD –
Figure 20. RS-422/485 Wiring Arrangements
SD Series Technical Manual
Invisible place holder
EIA-485 2-WIRE CONNECTIONS
TXD +
2
RXD+/TXD+
3
RXD +
7
RXD –
RXD–/TXD–
8
TXD –
This jumpering must be provided by user.
MDS 05-4846A01, Rev. D
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