ICS ELECTRONICS 4807, Instruction Manual

Page: 53 / 165

2-24
2
Table 2-7 shows a suggested ways to wire the serial connections to a 25-pin
or a 9-pin connector. The RS-232 Standard specifies female connectors
(DB-25S) for DCE devices and male connectors (DB-25P) for DTE
devices. The user can make Data Terminal (DTE) or Data Communication
(DCE) style interfaces for the end product. Add the handshaking signal
jumpers shown in Table 2-7 to the connector in case the mating serial device
relies upon the state of its handshake lines to send or receive data.
TABLE 2-7 SERIAL CONNECTOR WIRING EXAMPLES
FOR 25-PIN AND 9-PIN CONNECTORS
DCE DTE
Signal DB-25S DB-25P J4 Header
Pin# Pin# Pin# Signal
Shield 1 1 1 Chassis
RxD 2 3 2 BA Receive Data
TxD 3 2 3 BB Transmit Data
RTS 4 4 6 + 5 Vdc thru 2.2 K
Ω
CTS 5 5
DSR - 6
Gnd 7 7 7 Gnd
DCD 8
DTR 20 20
DSR 6 6 + 5 Vdc thru 2.2 K
Ω
DCD 8 6 + 5 Vdc thru 2.2 K
Ω
Signal DE-9S DE-9P J4 Header
Pin# Pin# Pin# Signal
RxD 2 3 2 Receive Data
TxD 3 2 3 Transmit Data
RTS 7 7 6 + 5 Vdc thru 2.2 K
Ω
CTS 8 8
DSR - 6
Gnd 5 5 7 Gnd
DCD 1
DTR 4 4
DSR 6 6 + 5 Vdc thru 2.2 K
Ω
DCD 1 6 + 5 Vdc thru 2.2 K
Ω
Notes: Jumper signals as shown or leave open.