Horner Electric's
SNP to RS232 Adapter
Product Specifications
and Installation Data
User's Manual
for the
HE693SNP232
,
HE693SNPCBL
and
HE693XTADP
RS232 SERIAL PORT WIRING
The HE693SNP232 SNP to RS-232 Adapter is equipped with two ports. The 15-pin "SNP" port plugs directly into the
PLC Programmer Port on the CPU rack power supply. Power to the SNP Adapter is supplied directly from the
programming port (maximum 25mA@5VDC). The 9-pin RS-232 port connects to any RS-232 device. The "pinout" for
the HE693SNP232 Adapter serial ports are defined below. The direction indicated is with respect to the adapter.
Pin
Number
Signal Name Direction
1, 3, 7 [0V] Ground N/A
2, 5 [+5V] VCC N/A
4 No Connection N/A
6 [CTS-] Clear to Send Input
8 [RTS+] Request to Send Output
9,10 [TXD-] Transmit Data Output
11 [TXD+] Transmit Data Output
12 [RXD-] Receive Data Input
13 [RXD+] Receive Data Input
14 [CTS+] Clear to Send Input
15 [RTS-] Request to Send Output
Pin
Number
Signal Name Direction
2 [TXD] Transmit Data Output
3 [RXD] Receive Data Input
5 [GND] Ground N/A
7 [CTS] Clear to Send Input
8 [RTS] Request to Send Output
This pinout was chosen to allow direct connection (using a straight through, or 1 to 1 cable) to the IBM PC/AT. Nearly
ALL of the IBM compatible computers equipped with a 9-pin RS232 port will provide a pinout compatible with that shown
above.
Table 1. 15-pin Port Table 2. 9-pin Port
12-11-97 MAN0079-05
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