GSE 350IS / GSE 355IS Service Manual - Advanced Weigh ...

3.5 Remote Key ConnectionsThe Model 350 I.S. and Model 355 I.S. accommodate two remote keys connections. Aremote switch may be connected to J11 on the main board to provide remote activationof print, tare, or zero functions. The remote switch being connected must be approvedfor the appropriate hazardous area and entity parameters.The connection for the remote switch input for remote key1 is between key 1 and GND.Connect a second remote switch to key 2 and GND. Refer to Figure 3.7 for anillustration of switch connections.A two-conductor shielded cable between 28 and 20 AWG is recommended. The inputrequires 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 specifiedat P800. A closed switch will conduct 2.2 mA.Switch 1 Switch 2Figure 3.7 Remote Key ConnectionDo not apply an external voltage to remote key terminals! Only a contactclosure is required to activate the remote key input.The open circuit voltage across the remote key pins is +5 VDC. A closed switch willconduct about 0.25 mA. Therefore, a low-voltage switch with gold-plated contacts isrecommended. A Mercury-wetted switch will also work well. Minimum contact durationof 100 ms is required. Once invoked, the selected remote key operation will not repeatuntil the contact is released and closed again. See page 75 for Remote KeyConfiguration.3.6 Remote Display ConnectionsIt is possible to connect one Model 350/355 I.S. indicator to another Model 350/355 I.S.and have the remote indicator display a copy of the master indicator or customize thedisplay of the remote (slave) indicator. The remote (slave) indicator's keypad willoperate the master indicator. Refer to Figure 3.8 to connect the master indicator to theremote (slave) indicator.Model 350 I.S. and Model 355 I.S. Service Manual 35