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To connect the MX2416RM Switcher to a control system or computer for RS-232 Control, only three pins are required on each port: Transmit (TX), Receive (RX), and Ground (GND). The Transmit pin from the control system or computer must be connected to the Receive pin of the switcher control port; do not connect Transmit to Transmit or Receive to Receive. The following are typical cable wiring pin outs: IBM PIN No. MX2416RM PIN No. 3 2 2 3 7 5 Connection IBM-PC 25-pin D to MX2416RM 9-pin D Note: 5, 6, 20 shorted together in IBM side only. 7 SWITCHERS IBM PIN No. MX2416RM PIN No. 2 2 3 3 5 5 Connection IBM-PC 9-pin D to MX2416RM 9-pin D Note: 4, 6, 8 shorted together in IBM side only. Port setting preferences for the control system or computer being used to control the switcher should be set as follows: BAUD RATE (Bits per second) 2400 Data bits 8 Parity None Stop Bits 1 There is no software or hardware flow control implemented. The RS-232 input has a 6-character buffer and will not execute additional commands until the previous command is fully processed. 7.2 RS-232 PROTOCOL [INP0] All channels OFF [INP1] Select Input 1 [INP2] Select Input 2 [INP3] Select Input 3 [INP4] Select Input 4 [INP5] Select Input 5 [INP6] Select Input 6 [RSET] Reset unit to user defaults [VERN] Returns firmware version numbers Inputs 5 & 6 are not selectable on the MX2414RM Commands must be issued as shown, in ALL CAPS and with the brackets [ ] included in the command string. After processing a valid command, an [OK] string will be returned. A command echo will also follow the [OK]. For instance, a command of [INP1] would return [OK][INP1]. The [VERN] command will return the corresponding software version being used by the switcher, such as an error string, [ERR] will be returned. If the control system being used is not setup to wait for the [OK] string, it is important to include a 100 milliseconds delay between each command. The MX2416RM Switcher is also designed to send feedback commands from the switcher to the control system when the buttons on the front panel of the switcher are pressed. The feedback codes are as follows: Key pressed Description Feedback Code 1 Input Select [INP1] 2 Input Select [INP2] 3 Input Select [INP3] 4 Input Select [INP4] 5 Input Select [INP5] 6 Input Select [INP6] STAND BY All Outputs OFF [INP0] RESET Reset [RSET][INPx] Inputs 5 & 6 are not selectable on MX2414RM. The following commands are added to the standard set of commands in order to facilitate control of multiple units using a single RS-232 control port. These commands are available on the switcher that has firmware revision number: 2.0. Use [VERN] commands to determine the firmware revision. These commands add additional flexibility to the switcher. [InnOmm] nn - Input Number 00 to 99 mm - Output Number 01-99 This command connects any input to any output. The switching occurs as soon as the command is completed. The input 00 is used to disconnect a particular output from any input. For example, command [I00O01] will disconnect output 1 from any input. 8 SWITCHERS [OUTmm] This command sets the switcher to respond to specific output only. The default setting is output 1. [SETxnnmm] x select input number nn Minimum input number mm Maximum input number This command is designed to allow the MX2416RM to program each input to respond to a selected range of input commands. For example, if command [SET10104] is issued, then the following commands will select only Input 1: [I01O01], [I02O01], [I03O01], and [I04O01]. In other words a range of I/O commands can address the same input. The default settings for each of the inputs are as follows Input 10101, Input 20202, Input 30303, Input 40404, Input 50505, and Input 60606. 7.3 MASTER-SLAVE CONFIGURATION These feedback codes allow multiple MX2416RM Switchers to be connected in a Master-Slave configuration, if desired. When the control ports of two units are connected as shown below, the slave unit duplicates the actions of the master unit. The same unit can still be controlled from its front panel or through another RS-232 control. MX2416RM 9-pin D MX2416RM 9-pin D Master PIN No. Slave PIN No. 2 3 5 5 Master-Slave Control Port Connection A Master-Slave configuration can be achieved also by Analog Switch Voltage using pin#9 and pin#7. MX2416RM 9-pin D MX2416RM 9-pin D Master PIN No. Slave PIN No. 9 7 5 5 Master-Slave Analog Switch Voltage Connection With this configuration the Master unit has ultimate control over slave unit. 7.4 CONTACT CLOSURE (ONE WIRE ANALOG) CONTROL The one wire control is an alternative to a multi- wire contact closure control. This control pin allows you to select different channels based on the DC voltage level on the pin 7 of the 9 pin D connector. Internally pin 7 is pooled up to 5 volts by 10k resistor. Thus, by selecting proper resistor values connected to ground any channel can be selected. Although the channel selection by the relay contact is latching and will maintain the last rel...

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