Holtgreven GSE-355 I.S. - Manual (Page 21)

12
The maximum recommended cable length is 50 feet (15 meters). However, much longer connections are possible if
using a properly shielded, low-capacitance cable.
Table 1: Serial Port Connections
Description
Label
(Die cast encl. only)
1 REM Remote Key REMOTE KEY
2 RXD Receive RXD
3 TXD Transmit TXD
4 +5V +5 VDC VCC
5 GND Digital Ground GND
6 GND Digital Ground GND
7 RTS Request-to-Send RTS
8 CTS Clear-to-Send CTS
9 PI Do Not Connect
A communication cable (P/N: 22-30-29752) may be purchased from GSE for connection to a serial device having a
DB25 or DB9 connector.
R
EMOTE
K
EY
C
ONNECTION
A remote key may be connected to the Model 350/355 communication port to provide remote activation of print, tare,
or zero functions.
The connection for the remote key input is between pin 1 and pin 6 of the DB9 communication port connector (see
Figure 12 for die cast, Figure 13 for stainless). A two-conductor shielded cable between 28 and 20 AWG is
recommended. The input requires a contact closure from a push-button switch, a ‘dry’ relay contact, a photo-eye, and a
proximity sensor or other such device. A closure initiates the operation specified at P800.
Do not apply an external voltage to remote key terminals! Only a contact closure is required to
activate the remote key input.
The open circuit voltage across the remote key pins is +5 VDC. A closed switch will conduct about 0.25 mA.
Therefore, a low-voltage switch with gold-plated contacts is recommended. A Mercury-wetted switch will also work
Figure 11: GSE Serial Cable, Part Number 22-30-29752