Specifications

18
MULTI-FUNCTION LINE DRIVER
4.2 RS-232 Serial Connections
The Multi-Function Line Driver’s RS-232 port is a standard DB25 connector
(pinout shown in Table 4-2 below). See Section 4.2.1 if you want to connect
the MFLD to a DTE (PC or printer) device. See Section 4.2.2 if you want to
connect the MFLD to a DCE (modem) device.
Table 4-2. Pinout of the RS-232 Interface
4.2.1 C ONNECTING THE MFLD TO A DTE D EVICE
This is the normal application for the Multi-Function Line Driver, which is
wired as a DCE. Because the MFLD is interface-powered, the best way to
connect it to a DTE (PC , printer, terminal, etc.) is to plug it right into the
DTE’s DB25 male RS-232 port. (After doing so, remember to insert and
tighten the MFLD’s two captive connector screws.) If the DTE has a DB9 male
serial port, use a DB9-female-to-DB25-male adapter (our product code
FA520). If you must use a cable to connect the MFLD to a DTE, make sure
that the cable is pinned straight through and that it is as short as possible (we
recommend 6 ft. [1.8 m] or less).
DIRECTION STANDARD RS-232/V.24 DCE PINNING DIRECTION
1 Protective Ground (PGND)
From MFLD Transmit Clock DCE (TCC) 15
2 Transmit Data (TD) To MFLD
3 Receive Data (RD) From MFLD
From MFLD Receive Clock DCE (RCC) 17
4 Request to Send (RTS) To MFLD
To MFLD Local Loopback (LL) 18
5 Clear to Send (CTS) From MFLD
6 Data Set Ready (DSR) From MFLD
To MFLD Data Terminal Ready (DTR) 20
7 Signal Ground (SGND)
To MFLD Remote Loopback (RL) 21
8 Carrier Detect (CD) From MFLD
9 +DCV To MFLD
To MFLD Transmit Clock DTE (TCT) 24
From MFLD Test Mode (TM) 25