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
