54 GENERAL D400 SUBSTATION GATEWAY USER’S MANUAL
RS-485 CONNECTIONS CHAPTER 4: CONNECTING TO DEVICES AND NETWORKS
The required RS-232 cable is a serial null modem, DB-9F to DB-9M cable. The cables must
be shielded and DB-9S connector covers must provide EMC shielding (e.g. metallized
plastic or die-cast metal covers).
See “RS-232 adapter” on page 33 for configuration options.
To connect RS-232
type devices to the
RS-232 adapter
Use the cable connection shown in Figure 30
Figure 30: RS-232 cable connection
Table 10: RS-232 Port DB-9 Connector Signal Definitions
a
DCD output not supported in DCE mode.
RS-485 connections
The D400 accepts connections to RS-485 2-wire and 4-wire type devices through the RS-
485 Adapter. The RS-485 Adapter (GE Item No. 520-0208LF) plugs into any serial
communication slot (slots 1 through 8) on the D400. It contains two independently isolated
RS-485 channels on a single terminal block: Channel 1 on terminals TB1-1 through TB1-5
and Channel 2 on terminals TB1-6 through TB1-10. Terminal blocks accept a range of 24-
14 AWG [0.2-2.1
mm²] Recommended wire strip length is 0.2" [5.0 mm]. Screws shall be
torqued with tool setting of 4.2 in-lb [0.46 Nm]. A 3.0 to 3.5 mm flat screwdriver tip is
recommended.
The transceiver in 2-wire mode and the receiver in 4-wire mode present 1 unit load (UL),
nominally 12 KOhm, to the external network with switches SW3/SW4 all off.
See “RS-485 adapter” on page 37 for configuration options.
Pin
Numbers
DTE (default) DCE
Signal Acronym Signal Flow Signal Acronym Signal Flow
1 DCD IN from DCE a a
2 RXD IN from DCE RXD OUT to DTE
3 TXD OUT to DCE TXD IN from DTE
4 DTR OUT to DCE DTR IN from DTE
5 Signal GND - Signal GND -
6 DSR IN from DCE DSR OUT to DTE
7 RTS OUT to DCE RTS IN from DTE
8 CTS IN from DCE CTS OUT to DTE
9 Not connected - Not connected -
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