ZETRON Model 25 - Computer Port Electrical Specifications; Computer Port Physical Specifications; Computer Port Communications Protocol Specifications

Index
025-9567E 133
the computer in response to the “*”, so the computer should wait one second before sending
any additional characters.
Computer Port Electrical Specifications
Parameter Description
RS-232 inputs
(RX-DATA, RMT-CTL)
Mark +0.7 to -15 volts
Space +1.5 to +15 volts
RS-232 outputs
(TX-DATA)
Mark -2.5 to -4.5 volts (at 4 mA)
Space +7.0 to +13 volts
RMT-CTL
(remote control signal)
Space remote control operating mode
Mark instant call operating mode
RX-DATA
(receive data signal)
1 second or more of continuous space
characters causes reset
Computer Port Physical Specifications
Parameter Description
Connector DE9-S (socket)
Signals
Pin 1 - DTR (data-terminal-ready) provides space
Pin 2 - no connection
Pin 3 - TX-DATA (transmit-data) from encoder
Pin 4 - RX-DATA (receive-data) to encoder
Pin 5 - GROUND (signal-ground)
Pin 6 - no connection
Pin 7 - RTS (request-to-send) provides space level
Pin 8 - CTS (clear-to-send) to encoder
Pin 9 - RMT-CTL (remote-control) space = remote
control
Computer Port Communications Protocol Specifications
Parameter Description
Type Asynchronous ASCII serial, non return to zero (NRZ)
Data bits Eight (8), most significant bit is zero
Parity None
Stop bits One (1)
Duplex Full duplex when in remote control mode
Baud Rate 4800, 600 or 150 baud in remote control