Pin Descriptions-Rs/Eia-422/485 Mode - GE TransNET 900 Reference Manual

Pin Descriptions—RS/EIA-422/485 Mode
Table 28 lists the
operate in RS/EIA-422/485 mode. See
Table 28. DATA connector pin descriptions—RS-422/485 Mode
Pin Input/
Number Output
1 —
2 OUT
3 IN
4 IN
5 --
6 --
7 IN
8 OUT
9 --
NOTES:
• RXD+ / RXB and RXD– / RXA are data sent to the radio to be transmitted.
• RXD+ / RXB is positive with respect to RXD– / RXA when the line input is a "0".
• TXD+ / TXB and TXD– / TXA are data received by the radio and transmitted.
• TXD+ / TXB is positive with respect to the TXD– / TXA when the line output is a "0".
EIA-422 4-WIRE CONNECTIONS
TXD –
2
3
RXD –
RXD + 7
8
TXD +
MDS 05-2708A01, Rev. F
DATA
connector pin functions for radios configured to
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.
Sleep—A ground on this pin turns off most circuits in a Re-
mote radio, including transmit, receive, modem, and diag-
nostic functions. This allows for greatly reduced power
consumption, yet preserves the radio's ability to be quickly
brought on line. See
mote Units Only)" on Page 59
Signal Ground (GND)—Connects to ground (negative sup-
ply potential) 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
"User Configurable I/O Connections" on Page
RXD –
RXD +
TXD –
TXD +
Figure 23. EIA-422/485 Wiring Schemes
Figure 23 for wiring schemes.
"Using the Radio's Sleep Mode (Re-
for details.
Invisible place holder
EIA-485 2-WIRE CONNECTIONS
TXD –
2
3
RXD –
7
RXD +
8
TXD +
This jumpering must be provided by user.
MDS TransNET Ref. Manual
73)
RXD–/TXD–
RXD+/TXD+
71