MercuryiTC
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7.1.2 Serial RS232 cabling requirements
The RS232 interface is connected via a 25-way D-socket on the rear page. The iTC is
configured as Data Circuit-terminating Equipment (DCE), with the standard pin-assignations
listed in the table below.
Most computer RS232 interfaces are configured as Data Terminal Equipment (DTE). If the
computer has a 25-way D-plug, the cable must be connected pin-to pin (i.e. Pin 1 to Pin 1, Pin 2
to Pin 2 etc.). If the computer has a 9-way D-plug, a standard RS232 9-way to 25-way cable is
required.
Pin Signal name Notes
1 FG Linked to chassis ground inside the iTC.
2 TD Data from the computer to the iTC.
3 RD Data from the iTC to the computer.
4 RTS Linked to Pin 5 inside the iTC.
5 CTS Linked to Pin 4 inside the iTC.
6 DSR Linked to +5 V when the iTC is powered.
7 SG Linked to digital ground inside the iTC.
8 DCD Linked to +5 V when the iTC is powered.
9 to 25 Open circuit
The iTC does not require signals to be present on the RTS or DTR (pin 20) lines. The RTS
signal is fed back to the computer as CTS. The iTC sends logic high levels (+5 V) to the
computer on DSR and DCD.
Voltage levels for the transmitted and received data are as follows.
Signal Allowed voltage
Tx data high >+5.5 V
Tx data low <-5.5 V
Rx data high threshold <+2.6 V
Rx data low threshold >+1.4 V
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